Worthy Cause (TMP) from Tempest, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: John Matson
• Card Text:
  Buyback 2 (You may pay an additional 2 when you play this spell. If you do, put it into your hand instead of your graveyard as part of the spell’s effect.)
  Sacrifice a creature: Gain life equal to the sacrificed creature’s toughness.