Crystal Keeper

Crystal Keeper is a Warrior pendulum effect monster card in Cards Realm Cards Realm.

[ 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 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 currently starts at 0.99. See live prices from multiple sellers in the Where to buy section above.

Crystal Keeper was first released in the set 2019 Gold Sarcophagus Tin Mega Pack, illustrated by Konami.

Legality depends on the tournament format -- Crystal Keeper can be legal in some formats and banned or restricted in others. See the full breakdown per format in the Legality section above.

Cards similar to Crystal Keeper include Devouring Sarcoughagus, Thunder Hand, Performapal Fire Mufflerlion. See the full list in the Similar cards section above.