Synod Artificer + Chromatic Orrery + Pemmin's Aura

Synod Artificer

Chromatic Orrery

Pemmin's Aura

How it works

1. Activate Chromatic Orrery's first ability by tapping it, adding 5.
2. Activate Synod Artificer's second ability by paying 1 and tapping it, untapping Chromatic Orrery.
3. Activate Pemmin's Aura's first ability by paying 1, untapping Synod Artificer.
4. Repeat for infinite mana.
5. Once you have infinite mana, you may instead use Chromatic Orrery's last ability to draw infinite cards.