Balou

Cannot attack or block
{2}: Put an Observation counter on a Permanent an opponent control
If 3 or more Observation counter is into play Balou can block and put a +2+2 counter on him.
If 5 or more Observation counter is into play Balou can attack and put a +2+2 counter on him.
If 7 Or more Observation counter is into play, Balou get Vigilance and Lifelink.
During your upkeep, If 10 or more Observation counter is into play You Win the game.