Paladin Class will do a lot of work in tokens/go-wide decks that have strong evasive commanders or top end, and those are likely the same decks thatll want to run Guardian of Faith
You can quite easily end up casting big flashy spells for just (3) mana, which, when youre also exiling that spell so they cant get it back, makes for quite a tempo swing
Doubling and no discard is amazing on a two-drop 0/4
Its a little easier to get rid of and stops fewer abilities, but this alone makes it more applicable in common Commander decks
Double strike with prowess is something not every creature can survive, and you should always have combat tricks and spells that give some form of evasion at hand to make this a serious finisher card
Not only that, but his arrival will enhance plenty of the Magic Broom cards that have arrived in the past few sets of Disney Lorcana