Furnace Reins

The Threaten effect has always run on a fixed exchange: pay a little red mana, borrow a creature for one attack, hand it back tapped and spent when the turn ends. What this version does is give the loan a residue. The old templates left you flat once the turn rolled over: the hasty body slipped back to its owner and the tempo swing was all you got. Here the borrowed creature carries a combat-damage trigger, so if it connects with a player or a battle it mints a single Treasure, one per damage event rather than one per point. That distinction matters: stealing a bigger creature does not scale the Treasure output, it just makes the swing hit harder, so the reward for a connection is the same modest artifact regardless of the body you commandeer. The trigger only fires on combat damage, which means the spell wants the creature swinging, not tapping for an ability or holding back on defense. And the Treasure outlasts the theft: the body reverts at end of turn, but the token stays, leaving color-fixing and ramp behind after the loan clears. That is the move worth marking. Earlier Act of Treason variants were pure aggression that ended when the turn did; this one leaves a permanent resource on the board, which is the difference between a spell a burn deck runs and one a value deck can justify.