For one mana, it deals with any threat, combo, hate piece, or key card at instant-speed and for a very low cost, offering answers to permanents like Deafening Silence, Pithing Needle, Rest in Peace, High Noon and others for a very low cost in addition to disrupting combos like Omniscience with ease
Subsequently, while one of the weird decks out there, Shadowborn Apostle-themed EDH decks are rather beloved
Sealed, for example, is a Limited format where you are given six booster packs to open
You can even easily kill a Commander player with their starting life total of 40 with aplomb
That means it scales incredibly quickly in Commander, making it a must-answer threat
Celestial Purge and Eight-and-a-Half-Tails give white a lot of space to play around with in this theme, but what about poor green