Andúril, Flame of the West

The whole design turns on a single word: legendary. Strap this sword to any creature and its attack trigger already builds a board: two 1/1 white Spirits with flying, every time it swings, growing an evasive squad across turns regardless of what carries the blade. What the supertype changes is timing. On a generic body those Spirits enter tapped and behind the assault, permanent tokens that miss the current combat but stand ready to attack or block on future turns. On a legend, the same two tokens enter tapped and attacking, converting the trigger from a slow accrual into two immediate points of evasive damage the turn it fires. That conditional is where the equipment earns its keep. The +3/+1 body is a reasonable but unremarkable rate; the legendary clause is the payoff, and it pays best in a deck already stuffed with legendary creatures. The design rewards a very specific board texture, the one where nearly everything you equip already carries the supertype, and the cheap equip cost keeps the trigger recurring as the blade passes from legend to legend. Read as a whole, this is less a generic gear slot than a legendary-matters engine wearing an aggressive stat line: the boost gets a body swinging, the token generation widens the air force either way, and the accelerated tokens land only when you have built toward legends on purpose. The rallying-the-dead flavor sits cleanly on a sword whose story was raising an army from the fallen.