Smax, Slayer of 765

Deathtouch, Ward—Sacrifice a creature.
Whenever Smax deals combat damage to a
player, halve that player's life total, rounded
down.
Smax gets +1/+1 for each creature it dealt lethal
damage this game.
If 20 or more of a player's creatures were dealt
lethal damage by Smax this game, that player
loses the game.