This delightful two-color loop relies on Arixmethes, Slumbering Isle doubling as both a powerhouse creature-land and a massive mana source, producing {G}{U} each time it taps. By enchanting Arixmethes with Pemmin's Aura, you gain a built-in untap engine for just one blue mana, which you can fuel directly using the blue mana generated by Arixmethes itself. Meanwhile, Ley Druid provides the crucial cross-untap effect needed to reset Arixmethes after it taps, closing the loop and netting an infinite surplus of green mana in the process.