Chaotic Goo is a rare Creature — Ooze card from Tempest (TMP), collector number 168. Current market price: $1.22, TCGplayer market prices via Scryfall.
This creature enters with three +1/+1 counters on it. At the beginning of your upkeep, you may flip a coin. If you win the flip, put a +1/+1 counter on this creature. If you lose the flip, remove a +1/+1 counter from this creature.