Turn Against

Threaten effects all converge on the same trick: borrow a creature, point it back at its owner, and turn the loan into permanent advantage with a sacrifice outlet before the turn ends. The move to instant speed is what rewrites how this one gets cast. Act of Treason and the baseline Threaten line already untap and grant haste, so the untap clause is nothing new; the difference is that you can hold this up. End-of-turn ambushes, mid-combat blowouts where you grab a tapped attacker and use it to block, or a reactive steal in response to your opponent's own combat math all become available, none of which a sorcery-speed version can do. Five mana is the tax for that window, two more than the cheap mono-red versions ask. The other distinction is the colorless identity. Devoid strips the red from the spell so it resolves as a colorless instant, which is the entire reason it exists rather than being one more reprint of the mono-red original: it slots into decks built around colorless-matters payoffs and cost reductions that read the spell's color, not its function. This sits at the expensive end of temporary-control effects, built less for raw tempo than for the kill-and-keep payoff: untap a blocker, swing for the alpha strike, then feed the borrowed body to an outlet so it never goes home.