Spell Queller (EMN) from Eldritch Moon, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Adam Paquette
• Card Text:
  Flash
  Flying
  When Spell Queller enters the battlefield, exile target spell with converted mana cost 4 or less.
  When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.