Cheapest priced copy (Duel Decks: Nissa vs. Ob Nixilis): $0.49 at Card Kingdom, near mint, their price list as of .
Desecration Demon 
Creature — Demon · 6/6 · Rare · Foundations · #603
Flying
At the beginning of each combat, any opponent may sacrifice a creature of their choice. If a player does, tap this creature and put a +1/+1 counter on it.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Nissa vs. Ob Nixilis | 44 | Rare | $0.49 | — |
| Foundations | 603 | Rare | $0.49 | — |
| Modern Masters 2017 | 66 | Rare | $0.59 | $3.49 |
| Return to Ravnica | 63 | Rare | $0.49 | $2.99 |
2 rulings from Wizards of the Coast
- 8 November 2024Players won't know which player, planeswalker, or battle Desecration Demon will attack, if any, when deciding whether to sacrifice a creature.
- 8 November 2024Each opponent in turn order may choose to sacrifice a creature, even if an opponent already chose to sacrifice a creature that combat. Desecration Demon will have a maximum of one +1/+1 counter put on it each combat, no matter how many creatures were sacrificed.