Cheapest priced copy (Theros Beyond Death): $0.99 at Card Kingdom, near mint, their price list as of .
Demon of Loathing 
Creature — Demon · 7/7 · Rare · Theros Beyond Death · #292
Flying, trample
Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Game Night: Free-for-All | 45 | Rare | $1.99 | — |
| Theros Beyond Death | 292 | Rare | $0.99 | $4.99 |
One ruling from Wizards of the Coast
- 24 January 2020If a creature is dealt lethal damage at the same time that Demon of Loathing deals combat damage to its controller, that player can’t sacrifice that creature.