This is amazing in Modern - shit in Vintage.
I think it's going to be pretty good in Legacy too. But I agree that Swords are basically bad in Vintage - but if one of them is going to be played it's probably this one.
@thewhitedragon69 if it's equipped already it stays equipped, and you'll still get the triggers until the dack player plays a creature to equip it to.
It's equipped, but the trigger owner is who control the sword. It doesn't give the ability to the creature.