Artillerize

The additional sacrifice cost is the whole transaction here: this is not a burn spell you cast on an empty board, it is a way to cash out a permanent you no longer want in exchange for five damage at instant speed. That reframes it as a sacrifice outlet first and a removal spell second. A token, a creature about to die in combat, a depleted artifact, a Treasure: any of these becomes ammunition, which means the card slots into decks already built to throw bodies away rather than into a generic burn shell. The five damage matters because it clears the rate most one-shot burn tops out at, enough to kill a mid-sized planeswalker or a creature that would shrug off three. The instant timing is what keeps the cost honest: you can wait until the sacrificed permanent has already done its work, sandbagging the spell as a combat trick or a response to removal so the creature dies usefully rather than for free. The constraint is that it does nothing without fodder, so the deck has to supply the input; in return it converts otherwise-wasted permanents into reach. It belongs to the lineage of aristocrats-adjacent payoffs that ask you to find value in things leaving the battlefield, and it answers the question of what to do with a permanent whose job is finished but whose death you would rather aim somewhere specific.