Enduring Renewal

A combo piece masquerading as a downside-laden enchantment. The downsides are real: a revealed hand surrenders all information, and every creature you would draw turns into a graveyard trip instead of a card. But the third line is the whole point. Returning any creature that dies from the battlefield to your hand closes a loop, and the loop wants the cheapest possible creature to live inside it. The classic engine pairs this with Ashnod's Altar and a zero-cost body like Shield Sphere or Ornithopter: sacrifice the creature for two colorless mana, Enduring Renewal hands it back, recast it for free, repeat. The mana the altar produces never gets spent recasting, so it pools, and a sacrifice outlet that triggers on each death (or a creature that deals damage when it leaves) converts the loop into a kill. What makes this design durable as a puzzle is that it asks for three independent pieces that each do nothing alone: a free recursion shell, a sacrifice engine, and a payoff that scales per iteration. The card itself contributes only the recursion clause; the builder supplies the rest. That structure has kept it pinned to the fringes: too narrow to support fair play, too dependent on a specific loop to function as anything but the keystone of a deck built backward from the win.