Lets check out the best X-spell commanders in the format
The game ships with two prebuilt player decks, one featuring Mulan and the other Yen Sid, and a third custom deck representing Ursula complete with its own special card back so you dont get the witchs legion of warped characters mixed up with your standard play cards
This alone make Containment Priest a solid sideboard option in the format
At a cost of seven ink, she isn't cheap to deploy, but combining her Shift 5 ability with cheap cards like Clarabelle - Clumsy Guest can make things happen a lot faster
If you run other Storm payoffs in the deck (and we recommend you do), you could use Regrowth (with Storm) to buy back a bunch of cards that upped your Storm count before attacking and do it all over again
Drawing cards whenever you make a token is quite the card advantage engine, and the Esper color combination is one of the better ones to do this in, especially with the passive token generation in white