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If the controller of Unyielding Gatekeeper's last ability controlled the target permanent at the time the ability began to resolve, the permanent will return to the battlefield tapped under that player's control, regardless of who its owner is

This would be a massive play if you have a high-cost item in your hand, something like Lucky Dime being played without using 7 ink would be massive and could single-handedly win you the game

It shows there's still a good amount of life left with it and it wouldn't surprise me if we see more in the future, meaning that you may find even more ways to rework your list in the future

In Limited, for example, this could be a solid role-player if you pick enough things that will benefit from its typing and resolution