Sure, it only hits permanents with mana value 4 or greater, but that still covers most of the big threats you care about in Commanderand it costs just pennies
This is a good card to play when theres a particular opposing character you really want to get rid of this turn, especially if you have something that can take the hits like a champ think Goofy, Knight for a Day or Lumiere, Hotheaded Candelabra
Though he only generates 1 point of Lore himself, along with 3 Strength and 6 Willpower, he has an ability that makes him an absolute powerhouse of a card
With plenty of seemingly useful cards in the reveals so far, theres plenty of reason to think youll be seeing more than a few decks used at local tournaments.
Joshua fits like a glove in Jeskai Oculus for this reason, playing a similar role to Tersa Lightshatter