Karn, Silver Golem (Foil) (V10) from From the Vault: Relics, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Foil
• Artist: Mark Zug
• Card Text:
  When Karn, Silver Golem blocks or becomes blocked, it gets -4/+4 until end of turn.
  1: Target noncreature artifact is an artifact creature with power and toughness each equal to its converted mana cost until end of turn.