Thrashing Mudspawn (ONS) from Onslaught, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Thomas M. Baxa
• Card Text:
  Whenever Thrashing Mudspawn is dealt damage, you lose that much life.
  Morph 1BB (You may play this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)