Flayer of the Hatebound

Two mechanics braid into one engine: undying wants the body in the graveyard, and the trigger wants it walking back out with teeth. When this Devil returns from your graveyard, it deals damage equal to its power to any target, and undying is the cleanest way to make that happen, no sacrifice outlet or reanimation spell required. The fragile 4/2 is the point: it trades into almost anything, and undying rebounds it with a +1/+1 counter, so it comes back as a 5/3 and immediately slings 5 damage wherever you like. That same counter is also the ceiling. It disqualifies the creature from dying with no counters on it, so the undying loop is one rebound deep without outside help; the Devil only burns twice if something else strips the counter or returns it again. The real reach is the clause covering another creature entering from your graveyard. Anything reanimated, recurred, or rebounded triggers a ping for that creature's power, which converts a reanimation chain into a string of targeted damage, each return scaling with whatever you drag back. Most of its output comes from the bodies returning around it, not from the Devil dying twice, which makes it a payoff in a graveyard shell rather than a standalone threat. It turns recursion, normally a value mechanic, into a reach mechanic, pointing every comeback at a face or a blocker.