Genji, The Assassin

+1: Genji, The Assassin becomes a 5/5 black/green rouge creature with unblockable until end of turn.
-2: Destroy up to 5 target permanents your opponent(s) control. Gain life equal to the highest converted mana cost among them.
-7: Destroy 10 permanents target opponent controls.You gain 4 life for each creature destroyed this way. Creatures you control 1 +2/+2 counter.