Primordial Ooze is a uncommon Creature — Ooze card from Legends (LEG), collector number 160. Current market price: $3.18, TCGplayer market prices via Scryfall.
This creature attacks each combat if able. At the beginning of your upkeep, put a +1/+1 counter on this creature. Then you may pay {X}, where X is the number of +1/+1 counters on it. If you don't, tap this creature and it deals X damage to you.