Ancient Warriors Saga - Defense of Changban

If your "Ancient Warriors" monster battles, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step. You can only use 1 of the following effects of "Ancient Warriors Saga - Defense of Changban" per turn, and only once that turn.
● At the start of your opponent's Battle Phase: You can send this face-up card from your Spell & Trap Zone to the GY; monsters your opponent controls cannot target "Ancient Warriors" monsters for attacks this turn.
● When an opponent's monster declares an attack: You can banish this card from your GY; Special Summon 1 "Ancient Warriors" monster from your Deck.