Flare of Duplication
Copying a spell is one of red's oldest tricks: Fork drew that line decades ago, and Reverberate refined the rate to two mana with a color pip attached. What changes the calculus here is the option to pay in flesh instead of mana, sacrificing a nontoken red creature to fire the copy for no mana at all. That reframes it from an expensive Reverberate into a tempo instrument, because the mana you would have spent instead goes toward whatever you are copying, and the duplicate resolves before the original does. The most vicious line is asymmetric: the copy chooses new targets, so you can point it at something the source spell was never aimed at. Copy an opponent's burn spell and redirect it at its own caster; copy a single-target removal spell to turn it into a two-for-one; copy a tutor, a ramp spell, or a draw spell and keep the second one for yourself. It lives in the same free-spell family that funds itself through sacrifice, where the standing question is whether the body you give up is worth more than the copy you get back. It also demands a live target, since it copies an instant or sorcery specifically and nothing else on the stack, which leaves it stranded against an opponent who fields only creatures and permanents.
