2 Level 5 monsters
You can target 1 monster your opponent controls; detach 1 material from an Xyz Monster you control, and if you do, destroy that monster. This is a Quick Effect if you control another WATER Xyz Monster. If another WATER Xyz Monster(s) you control is destroyed by battle or card effect while you control this monster: You can place 1 Spell from your Deck on top of your Deck. You can only use each effect of "Valiant Shark Lancer" once per turn.