Corporeal Projection

Myriad is normally a stat on the card itself, welded to a specific creature at printing. Detaching it into an instant-and-sorcery slot is the trick here: this hands the keyword out on demand, so any attacker you already control (a fat evasive threat, a creature with a devastating attack trigger, a lord that pumps whatever it copies) becomes a multi-headed strike against every opponent for a turn. The single-target mode is a cheap accelerant on one creature; overload converts it into a table-wide broadside, giving myriad to your whole board at once so an alpha strike splits itself across the pod. Two design details do the balancing. The copies are exiled at end of combat, so this buys tempo and reach rather than a permanent army, and myriad only spawns tokens against opponents other than the defending player, which is why the card reads as blank in a duel and only earns its keep when there are extra players to aim at. That multiplayer-shaped math is the whole point: it is a Izzet spell built to weaponize a wide table, scaling its damage output with the number of opponents rather than the size of the board.