This loop relies on turning your graveyard into a cloning vat with Dino DNA, using its six-mana creation ability to drop a massive 6/6 copy of Selvala, Heart of the Wilds onto the battlefield. Because Fervor grants your creatures haste, the newly minted legendary Selvala token can immediately tap for mana equal to its own greatest-among-creatures power, easily refunding the cost to make another and bypassing the legend rule by letting state-based actions sweep away the old copy. With Selvala's mana production scaling with her own pumped-up Dinosaur stats—and the potential to draw cards off her triggered ability if she's the biggest threat—you generate an endless cascade of enters-the-battlefield triggers, death triggers, and colored mana.