As a planeswalker, Tezzeret, Agent of Bolas acts like another player on your side of the battlefield, capable of activating one of its abilities each turn so long as you can pay the cost in the form of loyalty counters
Its not a bad card to drop in front of something red, either
Black has always been the best color for tutoring, and this neat new spell is no exception
That being said, while there is a little bit of demand, as a sideboard card, Stronghold Gambit is hardly an unmissable must-have
Now from the most recent Kamigawa: Neon Dynasty set, the deck has also gained Kappa Cannoneer, which has been a huge addition for the archetype
Being able to steal a players commander is often one of the most impactful plays in the format, and being able to do it for a measly two mana makes it clear that this card surely deserves its over-$200 price point on the secondary market