Ur-Drago, Slaughter Scion

Whenever a creature an opponent controls dies,
put a +1/+1 counter on Ur-Drago, Slaughter
Scion. If this ability has triggered three or
more times this turn, draw a card, then discard
a card. If this ability has triggered five or more
times put a +1/+1 counter on each creature you control.
If Ur-Drago's power is 22 or greater, you
lose the game.