Karador, Ghost Chieftain

The graveyard-as-hand idea, given a body. Reanimator strategies before this leaned on one big effect at a time: a Reanimate here, an Animate Dead there, each spell spending a card to return a single threat. The recursion offered here is a standing engine instead of a one-shot, letting you cast a creature spell from the yard every turn for as long as the chieftain stays on the battlefield (you still pay the returned creature's mana cost, so the engine rewards a curve of cheap recursion fodder over a single expensive bomb). The cost reduction is the other half of the design, and it inverts the usual penalty for a stuffed graveyard: every creature card sitting in the yard shaves a mana off this spell's own cost, so a deck built to fill the graveyard fast can replay this eight-mana body for a trivial sum. That tension (a graveyard you want as deep as possible, feeding a body you want back as cheaply as possible) is what gives the card its archetype identity rather than just a rate. The 3/4 body is almost incidental; nobody casts this to attack. What it sustains is a value loop where small creatures with enter-the-battlefield triggers, sacrifice fodder, and recursion targets cycle through the yard and the battlefield, the chieftain pulling one back each turn. The once-per-turn clause is the governor: it caps how often the engine fires, asking the deck to supply the rest of the throughput rather than letting the chieftain alone run away with the game.