Iroh is a very powerful Commander for a Lesson-focused deck
However, the most obvious use case for One with the Kami is as part of a game-winning combo
Now, how high do you think the serialized doctor cards will go?
Last March of the Ents Because green stompy needed one more piece of top end
With almost two-thirds of the deck cycling for a single mana(!), it becomes inevitable that you will draw multiple copies of this absurdly large Lightning Helix, and at this point, its hard to argue that it needs to do anything else to dominate
Assuming even a moderately progressed game and board state, being handed a choice between Craterhoof Behemoth, Rise of the Dark Realms, and Rivers Rebuke, knowing two of them are about to resolve, is going to leave you feeling pretty helpless