Serum Powder (Foil) (DST) from Darksteel, available at 401 Games Canada.

• Rarity: Rare
• Finish: Foil
• Artist: Matt Thompson
• Card Text:
  T: Add 1 to your mana pool.
  Any time you could mulligan and Serum Powder is in your hand, you may remove your hand from the game, then draw that many cards. (You can do this in addition to taking mulligans.)