Reaver Drone

One black mana buys an aggressive 2/1 body, and the price for that rate is a slow leak: you lose a point every upkeep you control no other colorless creature. That clause welds the card to its tribe. Cast alone it nickel-and-dimes you toward zero, so it earns its slot only inside a list dense enough in colorless bodies that the trigger almost never fires. Devoid is doing quiet structural work beneath the aggression: a creature paid for with black mana that reads as colorless feeds anything keyed to colorless permanents while leaning on a single black source, the identity-bending the Eldrazi designs traded on. The result is a beater that doubles as a commitment device, rewarding a board full of colorless threats and threatening to punish you the moment that board thins out. It functions as a barometer for how invested a deck actually is in the strategy it was built around. Plenty of one-mana 2/1s make no demands on the cards around them; this one wants proof that you meant it.