Mirror Entity (CMA) from Commander Anthology, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Zoltan Boros & Gabor Szikszai
• Card Text:
  Changeling (This card is every creature type.)
  X: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.