Gnurk, The Destroyer

Gnurk's power and toughness are equivalent to the
damage you have dealt to opponents this game.

If Gnurk's power is over 10, he gains trample.
If Gnurk's power is over 20, he gains reach.
If Gnurk's power is over 30, he becomes indestructible.

When Gnurk dies, you may destroy any permanent
an opponent controls; however, if you do this, you
must also sacrifice a permanent.