Rotting Greatwurm

Menace, trample
Whenever Rotting Greatwurm deals combat
damage to a player, put that many cards from
your library into your graveyard, then return a
creature card from your graveyard to your hand.
{b}{r}{g}, Sacrifice Rotting Greatwurm: shuffle
your graveyard into your library, then draw 3
cards.