Swamp Hydra

{b}{t} sacrifice a non-black creature, Swamp Hydra gets x +1/+1 counters, where x is the toughness of the sacrificed creature.
If you control a Swamp, you may cast Swamp Hydra from your graveyard as if from
your hand.
"Swamps don't have much healthy food for something that size. Those that stray near such places always end up as snacks."