By exiling Songs of the Damned beneath Elite Arcanist, you gain the ability to repeatedly cast a massive ritual whenever your graveyard has enough creatures to outpace the cost. The missing puzzle piece is Mycosynth Lattice, which turns all permanents—including the creature hosting Pemmin's Aura—into artifacts, letting you spend any color of mana freely. This gives you a continuous loop where Pemmin's Aura pays for its own untap ability to untap Elite Arcanist, fueling an infinite supply of colored mana as long as you have at least three creature cards in your graveyard.