The cost is horrific and in no way efficient but it isn't a total disaster if you are playing it out as a finisher
(A so-called state-trigger , which is what Garruk's first ability is, does not trigger again while its previous instantiation is still on the stack
By making creatures without flying unable to block, it turns a cluttered board into a clear path for a lethal swing
Staff of the Storyteller Staff of the Storyteller essentially gives you an extra card every turn if youre making tokens at roughly that pace or higher
In Innistrad: Midnight Hunt, one of these will be from the main set, while the other will be a made-for-Commander card that either comes from the set booster or the Commander pre-constructed decks' exclusive cards
Still, its really exciting to see such an overwhelmingly powerful item come into the picture, giving more credence to decks that want to focus specifically on items