Disintegrate

Two riders stacked onto an X-damage spell describe a design philosophy that has largely fallen out of fashion: pay full retail in mana, get a clean answer with no escape hatches. The regeneration shutoff matters because Alpha-era creatures leaned on regeneration as their primary defensive layer, and the exile rider closes the door on every recursion answer the graveyard offers. Read together, the two clauses turn a kill into an erasure. Fireball, printed alongside it, took the other branch of the X-burn chassis: split the damage across multiple targets and let the bodies fall to the graveyard normally. This one trades the splash for permanence. Modern burn has gone Fireball's direction and further, pricing efficiency at the front (Lightning Bolt, Lava Spike) and accepting that the graveyard is a real zone the opponent gets to use. This card belongs to a design era when regeneration was the load-bearing defensive keyword and exile was the premium rider you paid a variable cost to access. It has been functionally outclassed for decades (Demonfire, Banefire, and Comet Storm all iterate on the X-damage-to-anything frame with different riders), but the original states the idea without compromise: spend the mana, end the threat, and do not let it come back.