Pendulum Effect: Each turn, the first time an "Ultimate Crystal" monster(s) and/or "Crystal Beast" card(s) you control would be destroyed by card effect that turn, it is not destroyed.
Monster Effect: 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.
![Crystal Keeper [Flames of Destruction] [FLOD-EN093] | Gear Gaming Bentonville](http://bentonville.geargamingstore.com/cdn/shop/products/166529_200w.jpg?v=1570625882)
