Mana Echoes + Kiri-Onna + Chromatic Orrery

Mana Echoes

Kiri-Onna

Chromatic Orrery

How it works

1. Activate Chromatic Orrery's first ability by tapping it, adding 5.
2. Cast Kiri-Onna by paying 5.
3. When Kiri-Onna enters the battlefield, it and Mana Echoes trigger.
4. Resolve the Mana Echoes trigger, adding at least CCCCC.
5. Resolve the Kiri-Onna trigger, returning it to your hand from the battlefield.
6. Repeat from step 2.
7. If you control five Spirits except Kiri-Onna, this combo will net infinite mana.