The Black Stone of Legend [CORE-EN021] Secret Rare Yugioh but its original ATK becomes

but its original ATK becomes 0

Set: Duelist Alliance Card type: Xyz/Effect Monster Rarity: Ghost Rare Attack: 2500 Defense: 2100 3 Level 4 monsters While this card has Xyz Material

you must select the Toon Monster as an attack target

If a Toon monster(s) you control would be destroyed by battle or card effect

You can Tribute 2 monsters to destroy all monsters your opponent controls

The Black Stone of Legend [CORE-EN021] Secret Rare Yugioh but its original ATK becomesSet: Clash of Rebellions Card type: Effect Monster Rarity: Secret Rare Attack: 0 Defense: 0 You can Tribute this card; Special Summon 1 Level 7 or lower "Red Eyes" monster from your Deck, except "Red Eyes B. Chick". If this card is in your Graveyard: You can target 1 Level 7 or lower "Red Eyes" monster in your Graveyard, except "Red Eyes B. Chick"; shuffle it into the Deck, and if you do, add this card to your hand. You can only use 1 "The Black Stone