Wriggling Monstrosity

Menace, Undying, Deathtouch
{t}: If there are five or more creature cards in your graveyard, Wriggling Monstrosity gets three +1/+1 counters. Activate this ability only once.
{b/g}{t}: Sacrifice a creature. Wriggling Monstrosity gets a +1/+1 counter.
We need to burn this thing right now!