Ancient Cellarspawn 16 (Commander: Duskmourn: House of Horror)

Each spell you cast that's a Demon, Horror, or Nightmare costs {1} less to cast. Whenever you cast a spell, if the amount of mana spent to cast it was less than its mana value, target opponent loses life equal to the difference.

NM - $15.00
LP - $12.00
MP - $9.00
HP - $6.00
DMG - $3.00