Its an obvious inclusion in a Lord of the Rings focused version of the deck
Amethyst/Ruby is one of the most long-lasting and well-respected decks in the Disney Lorcana meta, but without the most common tools this archetype is known for, like the Merlin and Madam Mim bounce package, the Shimmering Skies starter deck version of Amethyst/Ruby is a different kind of deck than what we're used to seeing from these colors Which Deck Is Best For You
Finally, the deck features strong removal (Tail Swipe), card draw/acceleration (Joint Exploration), and 4 copies of the Weatherseed Treaty to further accelerate your mana and grow your creatures
Dragonstorm is certainly fun, you do have the good backup plan of just casting your dragons and sending them at face
There are multiple levels of difficulty that govern things like how many cards Ursula draws per turn and what tools you have to take her down
Bomat Bazaar Barge gives you a card which I think would be nice for your deck