Drag to the Underworld (THB) from Theros Beyond Death, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Victor Adame Minguez
• Card Text:
  This spell costs X less to cast, where X is your devotion to black. (Each B in the mana costs of permanents you control counts toward your devotion to black.)
  Destroy target creature.