YuGiOh! - Dark Apostle of the End Sigil

If this card is Tribute Summoned: You can banish 1 Spellcaster monster from your Deck; draw 1 card. Once per turn: You can place 1 “End Sigil Counter” on this card (max. 3). You can remove 3 “End Sigil Counters” from this card; destroy all monsters your opponent controls. You cannot attack the turn you activate this effect.