Cabal Executioner (ONS) from Onslaught, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Rebecca Guay
• Card Text:
  Whenever Cabal Executioner deals combat damage to a player, that player sacrifices a creature.
  Morph 3BB (You may play this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)