Primordial Ooze (CHR) from Chronicles, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Sandra Everingham
• Card Text:
  Must attack each turn if possible.
  At the beginning of your upkeep, put a +1/+1 counter on Primordial Ooze. At the end of your upkeep, pay X, where X is equal to the number of +1/+1 counters on Primordial Ooze, or Primordial Ooze deals X damage to you. If Primordial Ooze deals damage to you in this way, tap it.