Geargiano Mk-II [REDU-EN027] Rare Ultra Rare but the opponent's monster was

but the opponent's monster was not destroyed by the battle: You can make the opponent's monster's ATK 0 (even after this card leaves the field or the monster becomes unaffected by card effects)

You can only use each effect of "Aegaion the Sea Castrum" once per turn

change those monsters to face-down Defense Position

Set: Starter Deck: Kaiba Reloaded Card type: Effect Monster Rarity: Common Attack: 1700 Defense: 1300 You can send 1 Dragon-Type monster from your hand to the Graveyard

Geargiano Mk-II [REDU-EN027] Rare Ultra Rare but the opponent's monster wasSet: Return of the Duelist Card type: Effect Monster Rarity: Rare Attack: 1000 Defense: 500 When this card is Normal Summoned or Flip Summoned: You can Special Summon 1 "Geargia" monster from your hand or Graveyard in face up Defense Position.