Kah, the Wild Fang

Trample, menace
{6}{b}{g}: Monstrosity 5. This ability costs {1} less
to activate for each creature card in your
opponents graveyard. (If this creature isnt
monstrous, put five +1/+1 counters on it and it
becomes monstrous.)
Whenever Kah, the Wild Fang becomes
monstrous, creatures you control gain menace
and indestructible until end of turn.