Erratic Cyclops (GRN) from Guilds of Ravnica, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Milivoj Ćeran
• Card Text:
  Trample
  Whenever you cast an instant or sorcery spell, Erratic Cyclops gets +X/+0 until end of turn, where X is that spell's converted mana cost.