Titan of the Trench Patrol

Wave-1st or 2nd time (This ability is active during the specified battles of each turn): 1 When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets +2000 until end of that battle, and at the end of that battle, look at four cards from the top of your deck, search for up to one card with the wave ability from among them, call it to the this unit is on, and put the rest of the cards on the bottom of your deck in any order. If you called a card, put this unit on the bottom of your deck.