Bloodthirsy Brood

Trample, deathtouch, lifelink
Whenever a player loses the game, put ten +1/+1 counters on Bloodthirsty Brood.
Bloodthirst 4
Enrage - Whenever Bloodthirsty Brood is dealt damage, it gets flying and becomes a Dragon in addition to it's other types and each opponent loses 4 life.