Act of Treason

The clean modern template for borrow-and-swing. The effect predates this printing by years (Threaten was the original), but this version is the one Wizards settled on as the repeatable common-rarity benchmark: gain control, untap, haste, until end of turn. Everything in that package exists to make the stolen creature swing immediately, and the until-end-of-turn clause is the limit that keeps it a tempo play rather than permanent theft. The interesting wrinkle is what happens at the end of your turn, because the creature simply returns to its previous controller unless something intervenes. Pair it with a sacrifice outlet and the borrowed body never goes home: you get the attack and the death trigger and deny the creature back to its owner, converting a one-turn rental into outright removal plus value. That combination is the whole reason this effect has lingered as a build-around rather than a pure aggro card. Played straight, it is a measured aggressive swing, double-spending mana to turn an opponent's threat against them for one combat step; in the right shell it is the front half of a kill. The sorcery-speed restriction is the honest cost here, locking the steal to your main phase and your attack, so it can never ambush a blocker or hijack a creature in response to a spell.