Crystal Keeper [MP19-EN066] Common Gym Challenge 1st Edition all players cannot play "Backup"

all players cannot play "Backup" from their hands

Battleworn (When the combat chain closes

you may put that character on the top of your opponent's deck

Once you've Ritual Summoned your first monster and the special condition is met

Crystal Keeper [MP19-EN066] Common Gym Challenge 1st Edition all players cannot play "Backup"Set: 2019 Gold Sarcophagus Tin Mega Pack Card type: Pendulum Effect Monster Rarity: Common Attack: 1500 Defense: 1800 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.