Cheapest priced copy (Duskmourn: House of Horror Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Mayhem Devil 
Creature — Devil · 3/3 · Uncommon · The List · #WAR-204
Whenever a player sacrifices a permanent, this creature deals 1 damage to any target.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
8 printings · $0.69 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 225 | Uncommon | $0.69 | — |
| Edge of Eternities Commander | 121 | Uncommon | $0.79 | — |
| The List | WAR-204 | Uncommon | $0.99 | — |
| Ravnica Remastered | 199 | Uncommon | $0.69 | $2.49 |
| Ravnica Remastered | 374 | Uncommon | $0.79 | $4.99 |
| Secret Lair Drop | 1715 | Rare | $23.99 | $29.99 |
| Secret Lair Promo | 28 | Rare | $0.79 | $7.99 |
| War of the Spark | 204 | Uncommon | $0.79 | $2.49 |
5 rulings from Wizards of the Coast
- 3 May 2019Mayhem Devil itself doesn't allow any player to sacrifice any permanents. Its ability triggers whenever a player sacrifices a permanent because some other spell, ability, or cost instructed the player to do so.
- 3 May 2019You control Mayhem Devil's triggered ability and choose the target, no matter who sacrificed the permanent.
- 3 May 2019If you sacrifice Mayhem Devil, its ability triggers.
- 3 May 2019A legendary permanent that is put into a graveyard because of the "legend rule" isn't sacrificed.
- 3 May 2019If a permanent is sacrificed to pay a cost of a spell or ability, Mayhem Devil's ability will resolve before that spell or ability. Conversely, if a permanent is sacrificed during the resolution of a spell or ability, that spell or ability will finish resolving before Mayhem Devil's ability is put onto the stack.