Cheapest priced copy (Duskmourn: House of Horror Commander): $8.49 at Card Kingdom, near mint, their price list as of .
Gleeful Arsonist 
Creature — Human Wizard · 1/2 · Rare · Duskmourn: House of Horror Commander · #56
Whenever an opponent casts a noncreature spell, this creature deals damage equal to its power to that player.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $8.49 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 27 | Rare | $8.99 | — |
| Duskmourn: House of Horror Commander | 56 | Rare | $8.49 | — |
3 rulings from Wizards of the Coast
- 20 September 2024If Gleeful Arsonist is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how much damage it deals.
- 20 September 2024Gleeful Arsonist's first ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
- 20 September 2024Once undying returns the creature, it's considered a new object with no relation to the object that it was. Auras that were attached to it won't return to the battlefield. Equipment that was attached to it will remain unattached. Any counters that were on it won't be put on the new creature.