Cheapest priced copy (Duel Decks: Ajani vs. Nicol Bolas): $0.35 at Card Kingdom, near mint, their price list as of .
Slavering Nulls 
Creature — Goblin Zombie · 2/1 · Uncommon · Worldwake · #92
Whenever this creature deals combat damage to a player, if you control a Swamp, you may have that player discard a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Ajani vs. Nicol Bolas | 45 | Uncommon | $0.35 | — |
| The List | DDH-45 | Uncommon | $0.35 | — |
| Worldwake | 92 | Uncommon | $0.35 | $0.49 |