Kanata, the Unbroken

Flying, trample
Kanata enters the battlefield with a +1/+1
counter on it for each time it was cast from the
command zone this game. If three or more
+1/+1 counters were put on it this way, put a retribution counter on it.
Whenever Kanata deals combat damage to a
player, if it has a retribution counter on it, that
player loses the game.