Earthen Goo is a uncommon Creature — Ooze card from Coldsnap (CSP), collector number 80. Current market price: $0.21 (foil $0.51), TCGplayer market prices via Scryfall.
Trample Cumulative upkeep {R} or {G} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) This creature gets +1/+1 for each age counter on it.