For starters, I'd say you don't need 40 lands, and
chromatic lantern is overkill in 2-color decks with all the cheap duals they printed since
Scoured Barrens.
Other cards that could be cut, imho:
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Death Cultist: 1 life probably won't matter in commander
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Grim Harvest: Can you afford to pay 2B each time you sac something?
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Backup Agent: I don't see +1/+1 counters synergies.
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Sunbeam Spellbomb: as an artifact, it doesn't really synergize with the rest of the deck.
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Ammit Eternal: In your average 4-player game, this guy won't survive the turn cycle.