If a "Crystal Beast" monster you control battles an opponent's monster, during damage calculation (Quick Effect): You can Tribute this card from your hand or face-up from your field; your battling monster's ATK/DEF become double its original ATK/DEF during that damage calculation only, but it is destroyed at the end of this Damage Step.
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![Crystal Keeper [MP19-EN066] Common](https://img.toolsprestigeplus.shop/64/4558/2025052021/crystal-keeper-mp19-en066-common.webp)
