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So what

What affects the value of Umaro, Raging Yeti

If you've already got a lot of cards from The First Chapter, apart from the guaranteed foils in the 2 decks, it might be more cost-effective to put your money towards boosters, unless you're looking to pick up the cards from either of the starter sets quickly, then the fixed nature of the decks will get you those quicker than randomized boosters

Lands has been a formidable archetype in Legacy in recent years, and this card is banned in Modern for good reason

The Duke gives you the Blade of Selves ability without the additional mana investment, which means they're all aggro all the time