Master Transmuter + Sewer-veillance Cam + Chromatic Orrery

Master Transmuter

Sewer-veillance Cam

Chromatic Orrery

How it works

1. Activate Chromatic Orrery by tapping it, adding CCCCC which you can spend to activate Master Transmuter due to Chromatic Orrery's first ability.
2. Activate Master Transmuter by paying C, tapping it, and returning Chromatic Orrery from the battlefield to your hand, putting Sewer-veillance Cam from your hand onto the battlefield.
3. When Sewer-veillance Cam enters, it triggers, allowing you to untap Master Transmuter.
4. Activate Master Transmuter by paying C, tapping it, and returning Sewer-veillance Cam from the battlefield to your hand, putting Chromatic Orrery from your hand onto the vattlefield.
5. When Sewer-veillance Cam leaves the battlefield, it triggers, allowing you to untap Master Transmuter.
6. Repeat any number of times.
7. Once you have infinite mana, you may repeat the loop but activate Chromatic Orrery's last ability instead of its mana ability in step 1, drawing cards.