Mass Manipulation

Control Magic decided your commitment on a fixed schedule: pay four, steal one, forever. This one throws that away and prices the theft by the head. The double-X means each additional creature or planeswalker you rip away demands two more mana beyond the quadruple-blue base already anchoring the spell, so it scales from a merely expensive single-target steal into a battlefield inversion where you empty an opponent's board onto your own side in one sorcery. That structure is the whole point: it is a mana sink built to convert a late-game flood of untapped lands directly into permanents that were, a moment ago, threatening you. Where older control-theft spells (Control Magic, Confiscate, the various Mind Control descendants) each grabbed a single body and left an Aura you could disenchant, this leaves no attachment and no easy give-back; you simply become the controller of those permanents and stay that way for as long as the effect lasts. It also refuses to discriminate between creatures and planeswalkers, which pushes it past a mere blowout and into swing-the-whole-game territory when both sit across the table. The quadruple-blue commitment is the tax that limits when it comes online: it is not a spell you deploy early or off-color, and the turn you cast it for real value is a turn you have bent your entire mana development toward setting up.