This fascinating loop turns Jegantha, the Wellspring into a self-sustaining engine by utilizing its own strict color-piped mana—which conveniently matches the exact five-color cost required by Horde of Notions to cast creatures straight from the graveyard. By sacrificing Jegantha to Bloodflow Connoisseur, you send the Elk Avatar back to the graveyard to be immediately re-summoned by Horde of Notions, all while growing the Connoisseur with permanent +1/+1 counters. Meanwhile, Urabrask the Hidden ensures that Jegantha's repeated entrances happen immediately without any summoning sickness slowing down the repetition.