Muk

You may sacrifice a creature named Grimer rather
than pay this spells mana cost.
All Forest and Islands are Swamps in addition to
their other land types.
Muk can't have -1/-1 counters placed on it
Infect, Absorb 2.
Landfall —Whenever a land enters the battlefield
under your control, proliferate. (Choose any
number of permanents and/or players, then give each
another counter of each kind already there.)