Auton Soldier

The trick here is stapling two mechanics that were never meant to meet: the enters-as-a-copy clone, and myriad, a multiplayer attack keyword that spins off temporary token copies aimed at each opponent. Clones normally give you one body that mimics one creature; myriad normally lives on a fixed creature that just makes more of itself. Fuse them and the copy you choose becomes the template for the tokens, so a single attack fans out into a board's worth of whatever you pointed it at. Because the printed body is 0/0, this needs the clone half to survive at all: choose nothing and it dies immediately, so the copy target is not a bonus but a prerequisite. The tokens are full copies, so they carry the copied creature's stats, static abilities, and triggered abilities alike; what they don't get is a fresh attack trigger, because myriad's tokens enter already tapped and attacking, past the declare-attackers step. Any "whenever this attacks" clause on your target (including a second instance of myriad) never fires on the tokens; you get the bodies, not the cascade. The artifact-and-not-legendary rider is the quiet leash: it can copy a legendary bomb without folding to the legend rule, but it also becomes an artifact, opening it to a whole category of removal that would not otherwise touch a blue creature. It reads like a novelty crossover piece, and in most contexts it is one, but choosing your clone target and then multiplying that choice at every combat is a decision space neither parent mechanic offers alone.