It definitely feels like a reliable way to keep a problem commander out of the way for a few turns
Unlike other treasons, its actually possible to play Zidane as a kind of value card
Tap "Add to Cart" and hold up mana
Deathtouch creatures can be excellent for deterring attacks, so a recurring one can be deceptively powerful, even if you aren't using it as sacrifice fodder
Thats an eternity in Commander, so I wouldnt expect Concierge to come back more than once per game, but that also means the other creatures youre suspending in limbo also become non-factors most of the time
Until end of turn, it gains hexproof, reach, and "Whenever this creature becomes tapped, it deals damage equal to its power to up to one target creature." Instant Swiftfoot Boots Equipped creature has hexproof and haste