Sword of once and future
Sword of once and future: It CONFERS Protection from Blue/Black, the SWORD does not ITSELF have Protection from Blue/Black. Thus "Shifting Grift" should work in exchanging the Sword from an opponent with an artifact you control because THE SWORD ITSELF does not have this protection.
This was not the play mechanic in Arena where my opponent retained the sword, even though he STILL GOT MY ARTIFACT.
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Rezzahan#77802 commented
Did you try to move the equipment? Because it doesn't fall off just because you now control it. You have to use the equip ability or some other means to attach it to one of your creatures. As long as you don't, the equipment will stay attached and grant its bonuses to its wielder. If that wielder deals combat damage to a player, any player, YOU control that trigger, and YOU get its benefits.