Cheapest priced copy (Ninth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Demon's Horn 
Artifact · Uncommon · Darksteel · #116
Whenever a player casts a black spell, you may gain 1 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
11 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 320 | Uncommon | $0.39 | $1.49 |
| Ninth Edition | 294 | Uncommon | $0.35 | — |
| Ninth Edition | 294★ | Uncommon | — | $4.99 |
| Duel Decks: Divine vs. Demonic | 57 | Uncommon | $0.35 | — |
| Duels of the Planeswalkers | 91 | Uncommon | $0.49 | — |
| Darksteel | 116 | Uncommon | $0.39 | $0.99 |
| Duel Decks Anthology: Divine vs. Demonic | 57 | Uncommon | $0.59 | — |
| Magic 2010 | 209 | Uncommon | $0.39 | $0.49 |
| Magic 2011 | 204 | Uncommon | $0.39 | $0.49 |
| Magic 2012 | 205 | Uncommon | $0.39 | $0.79 |
| Salvat 2011 | 187 | Uncommon | — | — |
2 rulings from Wizards of the Coast
- 1 October 2009The ability triggers whenever any player, not just you, casts a black spell.
- 1 October 2009If a player casts a black spell, Demon’s Horn’s ability triggers and is put on the stack on top of that spell. Demon’s Horn’s ability will resolve (causing you to gain 1 life) before the spell does.