Primordial Ooze attacks each combat if able.
At the beginning of your upkeep, put a +1/+1 counter on Primordial Ooze. Then you may pay, 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.
10/4/2004 It becomes tapped even if the damage is prevented.