Old Flitterfang

The design pivots on a single passive trigger that turns any creature death, yours or the opponent's, into a Food token at every end step. That framing quietly makes this a payoff engine that doesn't care who's doing the killing: a board wipe, a combat trade, a sacrificed token across the table all feed it the same. The Food it produces isn't just a lifegain buffer either; it's fuel for the second ability, which eats another creature or artifact (Food very much included) to swing for a temporary +2/+2. So the two halves close a loop: deaths make Food, Food and other bodies feed the pump, and the pump does its own killing in combat to keep deaths coming. The finality of that loop is worth naming: each activation is a sacrifice, so the card wants a wide graveyard economy around it rather than a single card to protect. Black has circled the death-matters commander for a long time, from Grave Pact effects that punish the board to aristocrat payoffs that drain on each death; this one takes the passive-observer route, sitting back as a 3/4 flier and skimming value off attrition it never had to initiate. The flying body matters more than it looks: it gives the pump a reliable evasive outlet, so the fuel you're stockpiling can push damage instead of stalling on the ground.