Drain Life (2ED) from Unlimited Edition, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Douglas Shuler
• Card Text:
  Drain Life does 1 damage to a single target for each B spent in addition to the casting cost. Caster gains 1 life for each damage inflicted. If you drain life from a creature, you cannot gain more life than the creature’s toughness.