Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Reaver Drone 
Creature — Eldrazi Drone · 2/1 · Uncommon · Oath of the Gatewatch · #76
Devoid (This card has no color.)
At the beginning of your upkeep, you lose 1 life unless you control another colorless creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 76 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 22 January 2016Whether you control another colorless creature is checked as the ability resolves. This check will happen even if Reaver Drone leaves the battlefield in response to the ability.