Carbonize

The premium on burn here is exile: three damage to anything, plus a death-replacement clause that tucks the corpse away before it can be reanimated or recurred. That last clause is the design's whole reason for existing. A creature killed by Carbonize does not die in the ordinary sense; it leaves for exile, which means the graveyard-loop strategies that treat the graveyard as a second hand never get the body back. The regeneration shield, too, is stripped: a relevant safeguard in the era this was printed, when regenerators were a standard way to blank removal. What you pay for that insurance is one extra generic mana over the cheapest comparable burn, a tax that looks steep against straight damage but reads differently against a creature you specifically need gone for good. The wrinkle is that the exile only fires if the creature would die this turn, so it answers the thing in front of you, not a future recursion attempt; time it against a pending sacrifice or reanimation setup and it pre-empts the loop, fire it blindly and it is just slightly expensive removal. It is burn built for a matchup where the kill has to be permanent, and it prices that permanence honestly.