Godrick the Grafted

Reach
Whenever this kills a creature, it gains +1/+1 counters equal to that creature's toughness.
Whenever this kills a creature, gain {r}.
{r}: Deal 1 damage to a creature. If that creature has toughness higher than this creature's strength, gain {r}.
{t},{r}{r}{r}: Destroy all creatures all opponents control with toughness less than this creature's strength.