Malevolent Whispers

The Threaten line with one new rider: the borrowed creature gets +2/+0, so the body you commandeer for a turn hits harder than its owner ever built it to. The untap and haste are not bonuses here; they are what a steal-a-creature spell has always bundled, letting something that already attacked or tapped for an ability swing in fresh. Priced at full sorcery rate, that package is a poor deal, which is exactly what the second line answers. The madness clause is the same four mana, but it pays for itself by routing through a card you were going to pitch anyway: a rummaging effect or a forced discard becomes a tempo swing instead of a lost card, and your opponent had no reason to play around it. That is the whole card. Cast from hand, it is a weak entry in the steal line, a clunky four-drop that does something you can do cheaper. Discarded into its exile window, it folds a removal spell, a reach spell, and a sacrifice enabler into one cast: the stolen creature attacks for extra with the +2/+0, then gets fed to whatever wants a body before control reverts at the cleanup step. The design leans entirely on that distinction. The +2/+0 tips the borrowed creature from a temporary attacker into lethal math; the madness route is what keeps you from paying that full price out of hand, converting discarded chaff into the moment the spell wants.