Forger's Foundry

A mana rock that quietly builds its own spellbook. The first ability produces blue like any ordinary mana rock, but it tags the mana: spend it on a cheap instant or sorcery, and that spell files itself under the artifact on resolution instead of hitting the graveyard. Nothing about the exile is a payoff by itself; the payoff is the second ability, a sorcery-speed dump that recasts everything the Foundry has hoarded for free. The structure inverts the usual storm math. Instead of chaining spells in a single explosive turn, this asks you to bank low-cost effects across several turns, then cash the whole shelf at once, which turns a slow-drip stream of cantrips and small removal into a single overloaded burst. The three-or-less clause is the discipline: it keeps the reservoir stocked with the kind of spells that are individually unremarkable and collectively lethal, and it walls off the free-cast finale from big-ticket haymakers. What makes the design sharp is that it is a graveyard alternative that dodges graveyard hate entirely. Cards exiled here never touch the yard, so the usual answers (dredge cages, ground-clearers, exile-the-graveyard effects) do nothing, and the recursion lives in a zone most decks are not equipped to attack. It does the work of a graveyard engine without ever exposing itself to one, and the deck that wants it is the one measuring itself by volume of small spells rather than any single closer.