diff --git a/data/Mega Evolution/Ascended Heroes.ts b/data/Mega Evolution/Ascended Heroes.ts
index cdc339c3b6..300d260787 100644
--- a/data/Mega Evolution/Ascended Heroes.ts	
+++ b/data/Mega Evolution/Ascended Heroes.ts	
@@ -30,6 +30,19 @@ const set: Set = {
 	thirdParty: {
 		cardmarket: 6395,
 		tcgplayer: 24541
+	},
+
+	pullRates: {
+		rarities: {
+			'Double rare':                   { display: '1 in 5',   percent: 20 },
+			'Illustration rare':             { display: '1 in 9',   percent: 11.11 },
+			'Ultra Rare':                    { display: '1 in 21',  percent: 4.76 },
+			'Mega Attack Rare':              { display: '1 in 29',  percent: 3.45 },
+			'Special illustration rare':     { display: '1 in 70',  percent: 1.43 },
+			'Mega Hyper Rare':               { display: '1 in 540', percent: 0.19 },
+		},
+		// specialVariants omitted — reverse foils are fixed guaranteed slots
+		// per card, not probabilistic pull rates
 	}
 }
 
diff --git a/data/Mega Evolution/Ascended Heroes/265.ts b/data/Mega Evolution/Ascended Heroes/265.ts
index d958383e5f..18b7d6fffb 100644
--- a/data/Mega Evolution/Ascended Heroes/265.ts	
+++ b/data/Mega Evolution/Ascended Heroes/265.ts	
@@ -23,7 +23,7 @@ const card: Card = {
 	},
 
 	illustrator: "Saboteri",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 310,
 	types: ["Water"],
diff --git a/data/Mega Evolution/Ascended Heroes/266.ts b/data/Mega Evolution/Ascended Heroes/266.ts
index e214459805..4db70494b6 100644
--- a/data/Mega Evolution/Ascended Heroes/266.ts	
+++ b/data/Mega Evolution/Ascended Heroes/266.ts	
@@ -24,7 +24,7 @@ const card: Card = {
 	},
 
 	illustrator: "DOM",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 350,
 	types: ["Lightning"],
diff --git a/data/Mega Evolution/Ascended Heroes/267.ts b/data/Mega Evolution/Ascended Heroes/267.ts
index 25bfcf7487..86a2408b64 100644
--- a/data/Mega Evolution/Ascended Heroes/267.ts	
+++ b/data/Mega Evolution/Ascended Heroes/267.ts	
@@ -15,7 +15,7 @@ const card: Card = {
 	},
 
 	illustrator: "DOM",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 270,
 	types: ["Psychic"],
diff --git a/data/Mega Evolution/Ascended Heroes/268.ts b/data/Mega Evolution/Ascended Heroes/268.ts
index 331b65ba7a..228f2bc6b3 100644
--- a/data/Mega Evolution/Ascended Heroes/268.ts	
+++ b/data/Mega Evolution/Ascended Heroes/268.ts	
@@ -15,7 +15,7 @@ const card: Card = {
 	},
 
 	illustrator: "Taiga Kasai",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 250,
 	types: ["Fighting"],
diff --git a/data/Mega Evolution/Ascended Heroes/269.ts b/data/Mega Evolution/Ascended Heroes/269.ts
index dbb47cbc7d..1b8e9c358a 100644
--- a/data/Mega Evolution/Ascended Heroes/269.ts	
+++ b/data/Mega Evolution/Ascended Heroes/269.ts	
@@ -24,7 +24,7 @@ const card: Card = {
 	},
 
 	illustrator: "Taiga Kasai",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 350,
 	types: ["Darkness"],
diff --git a/data/Mega Evolution/Ascended Heroes/270.ts b/data/Mega Evolution/Ascended Heroes/270.ts
index 9757c6d85a..2baa7e1352 100644
--- a/data/Mega Evolution/Ascended Heroes/270.ts	
+++ b/data/Mega Evolution/Ascended Heroes/270.ts	
@@ -24,7 +24,7 @@ const card: Card = {
 	},
 
 	illustrator: "Taiga Kasai",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 330,
 	types: ["Darkness"],
diff --git a/data/Mega Evolution/Ascended Heroes/271.ts b/data/Mega Evolution/Ascended Heroes/271.ts
index 8837afde21..9b30f5c290 100644
--- a/data/Mega Evolution/Ascended Heroes/271.ts	
+++ b/data/Mega Evolution/Ascended Heroes/271.ts	
@@ -23,7 +23,7 @@ const card: Card = {
 	},
 
 	illustrator: "DOM",
-	rarity: "Ultra Rare",
+	rarity: "Mega Attack Rare",
 	category: "Pokemon",
 	hp: 370,
 	types: ["Dragon"],
diff --git a/interfaces.d.ts b/interfaces.d.ts
index ee5c21b950..6e0d4295c0 100644
--- a/interfaces.d.ts
+++ b/interfaces.d.ts
@@ -144,6 +144,44 @@ export type Types = 'Colorless' | 'Darkness' | 'Dragon' |
 
 type ISODate = `${number}-${number}-${number}`
 
+/**
+ * Represents a pull rate value.
+ * Can be a simple display string (e.g. '1 in 8') or an object
+ * with a required decimal percent for programmatic use.
+ * 
+ * @example '1 in 8'
+ * @example { display: '1 in 8', percent: 12.5 }
+*/
+export type PullRateValue = | string | {
+	display: string
+	percent: number
+}
+
+/**
+ * A pull-rate rule for a specific card variant.
+ *
+ * Any variant fields present on this object are used to match against a
+ * card's detailed variant entry. Fields that are not present are ignored.
+ *
+ * @example { type: 'reverse', foil: 'masterball', rate: { display: '1 in 40', percent: 2.5 } }
+*/
+export interface SpecialVariantPullRate extends Partial<variant_detailed> {
+	rate: PullRateValue
+}
+
+/**
+ * Pull rates for a set or booster.
+ * - `rarities` maps Card rarity strings directly to pull rates
+ * - `specialVariants` defines pull rates for specific variant treatments
+ * 
+ * Pull rates are derived from these and exposed on each entry in
+ * variants_detailed — they are never authored manually on individual cards.
+ */
+export interface PullRates {
+	rarities?: Partial<Record<Card['rarity'], PullRateValue>>
+	specialVariants?: SpecialVariantPullRate[]
+}
+
 export interface Set {
 	id: string
 	name: Languages
@@ -160,8 +198,22 @@ export interface Set {
 
 	boosters?: Record<string, {
 		name: Languages<string>
+
+		/**
+		 * Optional pull rate override for this specific booster.
+		 * Only define when this booster has meaningfully different
+		 * odds from the set-level pullRates.
+		*/
+		pullRates?: PullRates
 	}>
 
+	/**
+	 * The pull rate for a given rarity or variant.
+	 * Can be a simple display string (e.g. '1 in 8') or an object
+	 * with an optional decimal percent for programmatic use.
+	*/
+	pullRates?: PullRates
+
 	releaseDate: ISODate | Languages<ISODate>
 
 	thirdParty?: {
@@ -231,7 +283,8 @@ export interface Card {
 			'Shiny rare VMAX' | 'Special illustration rare' | 'Ultra Rare' | 'Uncommon'
 			// Black White rare
 			| 'Black White Rare'
-			| 'Mega Hyper Rare'
+			| 'Mega Hyper Rare' 
+			| 'Mega Attack Rare'
 			// Pokémon TCG Pocket Rarities
 			| 'One Diamond' | 'Two Diamond' | 'Three Diamond' | 'Four Diamond' | 'One Star' | 'Two Star' | 'Three Star' | 'Crown' | 'One Shiny' | 'Two Shiny'
 
diff --git a/meta/definitions/api.d.ts b/meta/definitions/api.d.ts
index d50764874b..37e093c37a 100644
--- a/meta/definitions/api.d.ts
+++ b/meta/definitions/api.d.ts
@@ -68,6 +68,14 @@ interface variant_detailed {
 		tcgplayer?: number
 	}
 	variantId: string
+	pullRate?: string | { display: string; percent?: number }
+}
+
+export type PullRateValue = string | { display: string; percent: number }
+
+export interface PullRates {
+	rarities?: Record<string, PullRateValue>
+	specialVariants?: Array<{ rate: PullRateValue } & Record<string, unknown>>
 }
 
 export interface SetResume {
@@ -148,7 +156,9 @@ export interface Set extends SetResume {
 		cardmarket?: number
 		tcgplayer?: number
 	}
+	pullRates?: PullRates
 }
+
 export interface CardResume {
 	id: string;
 	localId: string;
@@ -183,6 +193,13 @@ export interface Card extends CardResume {
 	 * - Secret Rare
 	 */
 	rarity: string;
+
+	/**
+	 * Derived pull rate for the card's rarity.
+	 * Populated from the parent set's pullRates.rarities.
+	*/
+	pullRate?: PullRateValue
+	
 	/**
 	 * Card Category
 	 *
diff --git a/meta/translations/de.json b/meta/translations/de.json
index 085a7c92e7..37622ac386 100644
--- a/meta/translations/de.json
+++ b/meta/translations/de.json
@@ -57,7 +57,8 @@
 		"Two Shiny": "Deux Chromatique",
 		"Three Shiny": "Un Chromatique",
 		"Black White Rare": "Schwarz-Weiß Selten",
-		"Mega Hyper Rare": "Mega Hyper Selten"
+		"Mega Hyper Rare": "Mega Hyper Selten",
+		"Mega Attack Rare": "Mega Angriff Selten"
 	},
 	"stage": {
 		"Baby": "Baby",
diff --git a/meta/translations/es.json b/meta/translations/es.json
index 4d46aacd39..5ac531444b 100644
--- a/meta/translations/es.json
+++ b/meta/translations/es.json
@@ -57,7 +57,8 @@
 		"Two Shiny": "Deux Chromatique",
 		"Three Shiny": "Un Chromatique",
 		"Black White Rare": "Rara Blanco y Negro",
-		"Mega Hyper Rare": "Mega Hiper Raro"
+		"Mega Hyper Rare": "Mega Hiper Raro",
+		"Mega Attack Rare": "Mega Ataque Rara"
 	},
 	"stage": {
 		"Baby": "Bebé",
diff --git a/meta/translations/fr.json b/meta/translations/fr.json
index e069e129e1..3cf3a39dd9 100644
--- a/meta/translations/fr.json
+++ b/meta/translations/fr.json
@@ -56,7 +56,8 @@
 		"Two Shiny": "Deux Chromatiques",
 		"Three Shiny": "Trois Chromatiques",
 		"Black White Rare": "Rare Noir Blanc",
-		"Mega Hyper Rare": "Méga Hyper Rare"
+		"Mega Hyper Rare": "Méga Hyper Rare",
+		"Mega Attack Rare": "Mega Attaque Rare"
 	},
 	"stage": {
 		"Baby": "Bébé",
diff --git a/meta/translations/it.json b/meta/translations/it.json
index b18f3292f3..15909ac27a 100644
--- a/meta/translations/it.json
+++ b/meta/translations/it.json
@@ -57,7 +57,8 @@
 		"Two Shiny": "Deux Chromatique",
 		"Three Shiny": "Un Chromatique",
 		"Black White Rare": "Rara Bianco e Nero",
-		"Mega Hyper Rare": "Mega Iper Raro"
+		"Mega Hyper Rare": "Mega Iper Raro",
+		"Mega Attack Rare": "Mega Attacco Rara"
 	},
 	"stage": {
 		"Baby": "Bambino",
diff --git a/meta/translations/pt.json b/meta/translations/pt.json
index 75dcbbd0fb..b445ce0b12 100644
--- a/meta/translations/pt.json
+++ b/meta/translations/pt.json
@@ -56,7 +56,8 @@
 		"Two Shiny": "Deux Chromatique",
 		"Three Shiny": "Un Chromatique",
 		"Black White Rare": "Rara Preto e Branco",
-		"Mega Hyper Rare": "Mega Hiper Raro"
+		"Mega Hyper Rare": "Mega Hiper Raro",
+		"Mega Attack Rare": "Mega Ataque Rara"
 	},
 	"stage": {
 		"Baby": "Bebê",
diff --git a/server/compiler/utils/cardUtil.ts b/server/compiler/utils/cardUtil.ts
index a67127b873..2537797a3d 100644
--- a/server/compiler/utils/cardUtil.ts
+++ b/server/compiler/utils/cardUtil.ts
@@ -7,6 +7,7 @@ import translate from './translationUtil'
 import { DB_PATH, cardIsLegal, fetchRemoteFile, getDataFolder, getLastEdit, resolveText, smartGlob } from './util'
 import { objectMap, objectPick } from '@dzeio/object-util'
 import { formatVariant, variantToIdentifier } from "./variantUtil.ts";
+import { deriveCardPullRate, deriveVariantPullRate } from './pull-rates.ts'
 
 export async function getCardPictures(cardId: string, card: Card, lang: SupportedLanguages): Promise<string | undefined> {
 	try {
@@ -90,6 +91,7 @@ export async function cardToCardSingle(localId: string, card: Card, lang: Suppor
 		name: resolveText(card.name, lang) as string,
 
 		rarity: translate('rarity', card.rarity, lang) as any,
+		pullRate: deriveCardPullRate(card),
 		set: await setToSetSimple(card.set, lang),
 
 		variants : Array.isArray(card.variants) ?
@@ -102,13 +104,13 @@ export async function cardToCardSingle(localId: string, card: Card, lang: Suppor
 		},
 
 		variants_detailed: Array.isArray(card.variants)
-			? await Promise.all(card.variants.map(async (variant, index) => {
-				const variantId = variantToIdentifier(variant);
-				let formattedVariant = formatVariant(variant,lang)
-
+			? await Promise.all(card.variants.map(async (variant) => {
+				const variantId = variantToIdentifier(variant)
+				const formattedVariant = formatVariant(variant, lang)
 				return {
 					...formattedVariant,
-					variantId
+					variantId,
+					pullRate: deriveVariantPullRate(variant, card)
 				} as ApiVariantDetailed
 			}))
 			: variantsToVariantsDetailed(card.variants, lang),
diff --git a/server/compiler/utils/pull-rates.ts b/server/compiler/utils/pull-rates.ts
new file mode 100644
index 0000000000..16554c7991
--- /dev/null
+++ b/server/compiler/utils/pull-rates.ts
@@ -0,0 +1,43 @@
+import { Card, PullRateValue, variant_detailed } from '../../../interfaces'
+
+/** 
+ * Returns true if all rules defined on 'rule' match the corresponding 
+ * fields on 'variant'. Fields not present on 'rule' are ignored 
+ */
+function variantMatchesRule(
+	variant: variant_detailed,
+	rule: Partial<variant_detailed>
+): boolean {
+	return (Object.keys(rule) as Array<keyof variant_detailed>).every(
+		(key) => variant[key] === rule[key]
+	)
+}
+
+/**
+ * Derives the pull rate for a specific variant from its parent set's pullRates.
+ * Returns undefined if no matching rule exists.
+ */
+export function deriveVariantPullRate(
+	variant: variant_detailed,
+	card: Card
+): PullRateValue | undefined {
+	const pullRates = card.set.pullRates
+	if (!pullRates?.specialVariants) return undefined
+
+	const rule = pullRates.specialVariants.find((r) => {
+		const { rate, ...match } = r
+		return variantMatchesRule(variant, match as Partial<variant_detailed>)
+	})
+	return rule?.rate
+}
+
+/**
+ * Derives the pull rate for a card's rarity from its parent set's pullRates.
+ * Returns undefined if no match exists.
+ */
+export function deriveCardPullRate(card: Card): PullRateValue | undefined {
+    const pullRates = card.set.pullRates
+    if (!pullRates?.rarities || !card.rarity) return undefined
+
+    return pullRates.rarities[card.rarity]
+}
\ No newline at end of file
diff --git a/server/compiler/utils/setUtil.ts b/server/compiler/utils/setUtil.ts
index 81856c8dc8..3316448099 100644
--- a/server/compiler/utils/setUtil.ts
+++ b/server/compiler/utils/setUtil.ts
@@ -56,10 +56,7 @@ export async function getSetPictures(set: Set, lang: SupportedLanguages): Promis
 		const file = await fetchRemoteFile('https://assets.tcgdex.net/datas.json')
 		const logoExists = file[lang]?.[set.serie.id]?.[set.id]?.logo ? `https://assets.tcgdex.net/${lang}/${set.serie.id}/${set.id}/logo` : undefined
 		const symbolExists = file.univ?.[set.serie.id]?.[set.id]?.symbol ? `https://assets.tcgdex.net/univ/${set.serie.id}/${set.id}/symbol` : undefined
-		return [
-			logoExists,
-			symbolExists
-		]
+		return [logoExists, symbolExists]
 	} catch {
 		return [undefined, undefined]
 	}
@@ -81,7 +78,7 @@ export async function setToSetSimple(set: Set, lang: SupportedLanguages): Promis
 }
 
 function getVariantCountForType(card: Card, type: 'normal' | 'reverse' | 'holo' | 'firstEdition'): number {
-	if( card.variants === undefined || card.variants === null) {
+	if (card.variants === undefined || card.variants === null) {
 		return 0;
 	}
 
@@ -103,11 +100,11 @@ export async function setToSetSingle(set: Set, lang: SupportedLanguages): Promis
 	const pics = await getSetPictures(set, lang)
 	return {
 		cardCount: {
-			firstEd: cards.reduce((count, card) => count + getVariantCountForType(card[1],"firstEdition"), 0),
-			holo: cards.reduce((count, card) => count + getVariantCountForType(card[1],"holo"), 0),
-			normal: cards.reduce((count, card) => count + getVariantCountForType(card[1],"normal"), 0),
+			firstEd: cards.reduce((count, card) => count + getVariantCountForType(card[1], "firstEdition"), 0),
+			holo: cards.reduce((count, card) => count + getVariantCountForType(card[1], "holo"), 0),
+			normal: cards.reduce((count, card) => count + getVariantCountForType(card[1], "normal"), 0),
 			official: set.cardCount.official,
-			reverse: cards.reduce((count, card) => count + getVariantCountForType(card[1],"reverse"), 0),
+			reverse: cards.reduce((count, card) => count + getVariantCountForType(card[1], "reverse"), 0),
 			total: Math.max(set.cardCount.official, cards.length)
 		},
 		cards: await Promise.all(cards.map(([id, card]) => cardToCardSimple(id, card, lang))),
@@ -134,6 +131,13 @@ export async function setToSetSingle(set: Set, lang: SupportedLanguages): Promis
 			name: resolveText(booster.name, lang),
 			// images will be coming soon...
 		})) : undefined,
-		thirdParty: set.thirdParty
+		pullRates: set.pullRates ? {
+			rarities: set.pullRates.rarities,
+			specialVariants: set.pullRates.specialVariants?.map(({ rate, ...rest }) => ({
+				...rest,
+				rate
+			}))
+		} : undefined,
+		thirdParty: set.thirdParty,
 	}
 }