Elite Arcanist + Battle Hymn + Chromatic Orrery + Pemmin's Aura

Elite Arcanist

Battle Hymn

Chromatic Orrery

Pemmin's Aura

How it works

1. Activate Elite Arcanist's ability by paying 2 and tapping it, casting a copy of Battle Hymn without paying its mana cost.
2. Resolve Battle Hymn, adding at least 3.
3. Activate Pemmin's Aura's first ability by paying 1, untapping Elite Arcanist.
4. Repeat.
5. If you control four or more creatures, this combo nets infinite mana.

This intricate loop starts by using Elite Arcanist to repeatedly cast a copied Battle Hymn from exile, fueling the engine with red mana based on your creature count. To sustain the cycle, Pemmin's Aura steps in to untap the Arcanist for a mere single mana, turning every iteration into a net positive as long as you control four or more creatures. Meanwhile, Chromatic Orrery quietly patches any color restrictions by letting you spend your massive mana pool as though it were any color, ensuring your infinite mana production can power anything you desire.