Jadar, Ghoulcaller of Nephalia

The tension every token-generator answers is upkeep versus payoff: a body that makes chaff each turn either floods you with mana costs or asks you to build around the chaff. This resolves it by making the generator itself free after deployment. Two mana buys a recurring stream of expendable bodies that costs nothing else to sustain, gated by a single condition that gates itself: the token only arrives when the previous one is gone, so the decayed keyword handles the throttling. A decayed Zombie can't block and sacrifices itself the turn it attacks, which means each token either fed something or crashed in for two, and either way it clears the board state for next turn's replacement. That self-clearing loop is the whole engine: a sacrifice fodder faucet that never needs priming and never clogs. What makes the design worth the legendary slot is that the chaff is fungible in a way most token-makers aren't. A blocker-less, self-destructing 2/2 is nearly useless in a vacuum, which is exactly why it slots into decks that want a body to spend rather than keep: sacrifice outlets, aristocrat drain triggers, any engine hungry for a fresh corpse each turn. The 1/1 frame keeps the value-per-turn low enough that the card lives or dies on the shell around it, but the shell rarely has to pay the token any attention: it simply appears at the end step and asks to be used.