Exterminator Magmarch

Spellcopy has been a blue trick for most of its history: Twincast, Fork, the storm cards. This body drags the mechanic into Rakdos and welds it to a multiplayer-only condition. The trigger only fires when your removal or burn spell aims at exactly one nonland permanent an opponent controls, and only when a different opponent has a legal target for the same spell. In a duel it does nothing; the ability is built to punish the table, turning every targeted Doom Blade or Lightning Bolt into a two-for-one that hits across seats you were not even attacking. The reward is a free copy that lands on a chosen permanent, so a single point-and-shoot spell becomes a symmetrical strike against whichever second opponent you pick. The 5/3 for four is a genuine threat that dies to almost any blocker, which is where the regeneration matters: a repeatable shield that keeps the engine on the board through combat and one-sided sweepers, provided you can spare the black mana. The whole package reads as a construct designed for a specific political geometry: it wants a board with several opponents, a hand full of cheap single-target interaction, and a pilot willing to spread the pain. Take that context away and the trigger never checks in; the ability only reads a board with more than one opponent to punish, and pays for its ceiling by going blank the moment the table narrows.