: Exile target card from an opponent's graveyard. If no cards are in that graveyard, flip this creature.
: Put target creature card from a graveyard onto the battlefield under your control.
Nezumi Graverobber is a cheap mono-black commander that grinds the game out through graveyard attrition, exiling opponents' best cards while flipping into Nighteyes the Desecrator to become a powerful reanimation engine. You play efficient removal and disruption early, use the ability to empty an opponent's graveyard for the flip, then repeatedly steal the best creatures from any graveyard with the ability. The deck wins on value and inevitability, reanimating threats your opponents kill or discard.
Cheap two-mana commander that provides graveyard hate and reanimation in one card
Repeatable, instant-speed-ish recursion shuts down opposing graveyard strategies while feeding your own board
Mono-black gives access to the best tutors, ramp, and removal in the format
Self-recurring threat: hard to permanently deal with since you can recast it cheaply
The ability is mana-hungry and only one activation per turn unless you untap
Relies on opponents (or yourself) filling graveyards with worthwhile creatures
Mono-black struggles with enchantments and noncreature permanents
No evasion or protection built in; the commander is fragile and a removal magnet
Flipping requires an opponent's graveyard to be empty, which can be awkward to set up