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
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?)
Pauper : Pauper is a hyper-competitive format where you can only use commonsthe least rare cards in Magic
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
FAIR USE DISCLAIMER As usual with these sorts of lists, Im more interested in capturing an interesting cross-section of powerful spells than I am in choosing a strict definition of what makes one best