Poxwalkers

The recursion clause is the whole design conceit: this Zombie crawls back not when a creature dies or a sacrifice fires, but specifically whenever you cast a spell from anywhere other than your hand. That trigger is unusually narrow and unusually rewarding at once. Cascade, flashback, foretell, adventure, escape, impulse-draw payoffs, casts from exile or the command zone: any of these returns the Poxwalkers to the battlefield tapped, turning them into a body that reassembles itself in step with a spellslinging engine rather than a sacrifice loop. The deathtouch keeps the 3/1 relevant as a repeatable trade even when it returns tapped and cannot block: a recurring attacker no blocker wants to eat. Because the body is fragile and the return conditional, the card sits inert in a deck that plays fair from hand and grows nearly impossible to keep dead in a deck that never does. It is a payoff dressed as a beater, asking you to build a shell where "cast from somewhere else" is routine rather than accidental. Like any graveyard engine it lives and dies by its yard, so an exile effect answers it cleanly; its resilience is against removal that merely kills, not against hate that strips the graveyard as a resource.