This clever loop relies on Jegantha, the Wellspring's unique restriction-defying mana ability, which generates the exact five-color requirement—{W}{U}{B}{R}{G}—needed to fuel Horde of Notions' recursion ability without paying any generic mana costs. By sacrificing Jegantha to Bartolomé del Presidio, you send the Elk Avatar straight to the graveyard where Horde of Notions can immediately recast it for free. Meanwhile, Akroma's Memorial quietly stands guard, ensuring your entire team boasts an overwhelming suite of keywords like flying, vigilance, and haste while your sacrifice loop churns out infinite death triggers and a massively growing Bartolomé.