Casting it at the right time leaves you untouched while your opponents swing wildly at each other, breaking alliances and clearing the way for your own follow-up
Theres the simple application of Drumbellower, untapping your creatures so that you can attack and still have some defense
The Mardu Surge deck emphasizes combat and tokens, with commanders rewarding token sacrifices and value
The first is her -3 to destroy everything with a 4 power or greater, which only kills a few Angel and Zombie tokens, so this is a backup mass removal that will only hurt your foes, but it leaves behind more than Mass Calcify
Going under emerge decks seems like the best thing possible you can be doing
It still wont always line up that way, as sometimes your opponent has small stuff too, but Expel does make it possible for you to make this feel more one-sided, and that makes it quite powerful, especially because it still effectively has the usual Wrath upside of just nuking the whole board This has somewhat passable stats, and it has an ability that is useful, albeit expensive