Here are the deck lists for the two starter decks in Ursula's Return
Knowing it was time to move on, the Gitrog Monster heaved itself out of the waters and headed straight for Thraben, where it found Thalia, the last survivor of her cathar squad, about to be overwhelmed by Phyrexians
I classify it as a very causal Bracket 1-2 deck, though the presence of Crop Rotation unfortunately means its technically Bracket 3 (why is Crop Rotation a Game Changer again?)
My first thought for how to abuse a mana dork like Jegantha, the Wellspring would be to run ways to untap her that will allow you to go infinite, but those generally all involve paying generic mana costs
I love it in ramp to win the game and make your other big stuff trample, madness, discard matters, Golgari self-mill, Jund's Lord Windgrace lands return to the battlefield from the graveyard, Sultai's self-milling Sidisi, Brood Tyrant, blink, midrange, tokens, and loads more