Earthen Goo | Magic: The Gathering
Formats Earthen Goo is Legal in
Official Oracle Text for Earthen Goo
Cumulative upkeep or (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.)
Earthen Goo gets +1/+1 for each age counter on it.