Cheapest priced copy (Torment): $1.79 at Card Kingdom, near mint, their price list as of .
Putrid Imp 
Creature — Zombie Imp · 1/1 · Common · Torment · #77
Discard a card: This creature gains flying until end of turn.
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and can't block.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $1.79 to $44.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Premium Deck Series: Graveborn | 1 | Common | — | $4.49 |
| Torment | 77 | Common | $1.79 | $44.99 |