Cheapest priced copy (Duel Decks: Divine vs. Demonic): $0.79 at Card Kingdom, near mint, their price list as of .
Soot Imp 
Creature — Imp · 1/2 · Uncommon · Eventide · #43
Flying
Whenever a player casts a nonblack spell, that player loses 1 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.79 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Divine vs. Demonic | 37 | Uncommon | $0.79 | — |
| Duel Decks Anthology: Divine vs. Demonic | 37 | Uncommon | $1.79Out of stock | — |
| Eventide | 43 | Uncommon | $0.79 | $7.99 |
2 rulings from Wizards of the Coast
- 1 August 2008This ability affects all players, including you.
- 1 August 2008A hybrid spell that’s black and another color is *not* a nonblack spell. Since it’s black, it can’t be nonblack!