First printed in Duskmourn: House of Horror Commander (2024)
Enchantment Creature — Horror
Each spell you cast that's a Demon, Horror, or Nightmare costs 
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.
Where it treads, plants wither. Where it breathes, poison spreads.
3/3
- Illustrated by
- Alexandre Honoré
Legality
- Legal in
- Legacy, Vintage, Commander, Duel Commander, Tiny Leaders, Oathbreaker
- Not legal in
- Standard, Pioneer, Modern, Pauper, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Gladiator, Pauper Commander, PreDH, Brawl, Standard Brawl, Competitive Brawl
Rulings (4)
- If the spell is no longer on the stack when Ancient Cellarspawn's last ability resolves, use its mana value as it last existed on the stack.
- Ancient Cellarspawn's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
- To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
- For spells with
in their mana costs, use the value chosen for X to determine the spell's mana value.
Prices
MTGO price: 2.58 TIX, the cheapest non-foil print (average sell price on GoatBots, 30 Oct 2026).
