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But then we get Averna, the Chaos Bloom, which gives us more value each time we cascade

You might be able to do something using plot to set up spells, then sacrificing this card to unload, but the more likely use case is slotting it into the sideboard for times when it'll be really impactful

Start Your Engines on a 6 mana Commander is asking a lot , but given you get cost reduction based on your speed and not having Max Speed (and the same goes for your buff to the team), the payoff seems reasonable

Since Valley Floodcaller can come down at instant speed, there is a chance that players experiment with this, but losing your enabler to the Ultima might make this a bit too resource-intensive for control decks