When this card is activated: You can add 1 monster that mentions "Assault Mode Activate" from your Deck or GY to your hand. "/Assault Mode" monsters cannot be destroyed by battle or your opponent's card effects during the turn they are Special Summoned. You can pay 2000 LP; once this turn, you can activate "Assault Mode Activate" by Tributing a Synchro Monster in the Extra Deck. You can only use this effect of "Duel Evolution - Assault Zone" once per turn. You can only activate 1 "Duel Evolution - Assault Zone" per turn.