Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Gravity Negator 
Creature — Eldrazi Drone · 2/3 · Common · Oath of the Gatewatch · #45
Devoid (This card has no color.)
Flying
Whenever this creature attacks, you may pay {C}. If you do, another target creature gains flying until end of turn. ({C} represents colorless mana.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 45 | Common | $0.35 | $0.49 |