Idol of Endurance

A recursion engine that pays for its power up front and then rations it. The entry clause is a wide sweep, scooping every small creature out of your graveyard at once, but the payoff is deliberately throttled: the activated ability taps the artifact and only lets you cast from the exiled pool until end of turn without paying mana. So the value is not "reanimate everything" but "one free small creature per activation, drawn from a locked reserve, as long as this survives." That last conditional is the real cost. The exiled cards ride on the artifact's presence; blow up the Idol and the whole reserve falls back into the graveyard, undoing your setup at once. It reads worse than a clean answer to a permanent because your opponent is spending removal to reset a pile you already had, but the exchange is still one-for-one: you lose the Idol, they spend a card, and the creatures land back where they started. The reserve only shrinks: each cast moves a card to the stack and then the battlefield, leaving exile for good, so this is a one-time toolbox you draw down rather than a loop you refill. The ability itself carries no timing restriction, easy to miss when creature spells feel like sorcery-speed business: aim it at a creature with flash and you can flash in a blocker or a fresh enter-the-battlefield trigger on an opponent's turn. It fills white's traditional recursion gap without granting outright reanimation; the exile-until-leaves template keeps the effect a lease, not a purchase.