Fabrication Foundry

The trick lives in the second ability's exile clause: this is not free recursion but a transmutation, converting artifacts you already control into a single larger one. Exile total mana value X, return a card worth X or less. That framing rewards a board where the individual pieces are disposable but collectively worth more when reassembled, so the intended fodder is your genuinely-costed artifacts (a spent equipment, an expired vehicle, a two-drop rock that has outlived its use) rather than tokens, which contribute nothing to X. The sorcery-speed clamp keeps the swap in check against instant-speed value loops, forcing the exchange onto your own main phase where an opponent sees it coming. Underneath sits the quieter half, a mana rock that taps for white you can only spend on artifacts, which sounds like a restriction until you notice both abilities point at the same deck: build dense enough with artifacts and the color-locked mana is never a dead source, while the graveyard loop always has a target worth its exile price. White has a long history of returning small permanents and artifacts from the yard, so the recursion clause is not smuggling in a foreign effect; what is unusual is the double payment the return demands. You do not just pay the : you also cannibalize board presence, shrinking the number of things you control to buy back one bigger thing. That self-consumption is what pays for the effect, a recursion engine funded by attrition against your own side of the table.