Grine, Mire Guardian

Triumphant, deathtouch, trample
Whenever Grine, Mire Guardian deals combat
damage to a player, put that many cards from the
top of your library into your graveyard.
{x}{b}{g}: Exile X cards from your graveyard, target
creature gets -X-X until end of turn and you add
X mana of any one color to your mana pool and
draw a card.