Slumbering Tora (BOK) from Betrayers of Kamigawa, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Doug Chaffee
• Card Text:
  2, Discard a Spirit or Arcane card: Slumbering Tora becomes an X/X artifact creature until end of turn, where X is the discarded card's converted mana cost.