Creature — Ooze 1/1, R (1)
Uncommon
Primordial Ooze attacks each turn if able.
At the beginning of your upkeep, put a +1/+1 counter on Primordial Ooze. Then you may pay {X}, where X is the number of +1/+1 counters on it. If you don't, tap Primordial Ooze and it deals X damage to you.
Illus. Randy Gallegos

10/4/2004: It becomes tapped even if the damage is prevented.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander