Crater's Claws

Most X-burn spells charge a tax for flexibility: Fireball's per-target surcharge, Banefire's uncounterability bolted onto a worse rate. This one refuses the tax entirely. It points X damage at any target for exactly X plus a red, a clean rate that earns its keep before the keyword ever comes online. Ferocious is what turns it from curve-filler into a deck slot worth defending: control a creature with power 4 or greater and the spell deals X plus 2 as it resolves, one more damage than the total mana you sank into it. That upside is not a triggered ability waiting on the stack; it is a replacement effect that rewrites the damage on resolution, checking the board once and applying the flat bonus regardless of how large X grows. The design logic is the trade most X-spells will not make. Instead of stapling a keyword onto a fixed rate, it ties the extra two points to a board state an aggressive red deck already wanted, so the same mana produces its best output precisely when the deck is doing what it was built to do. It reaches the widest with the mana untapped on your own turn, when a full board lets a hard cast bridge the last chunk of damage a fixed-rate burn spell could never cover. Outside that shell it is a serviceable, slightly inefficient finisher; inside it, the plus-2 is the gap between a topdecked blank and a topdecked win.