Master Transmuter + Sewer-veillance Cam + Chromatic Orrery Combo

Sewer-veillance Cam in hand.

Master Transmuter and Chromatic Orrery on the battlefield.

Master Transmuter does not have summoning sickness.

Activate Chromatic Orrery by tapping it, adding which you can spend to as though it were mana of any color as long as Chromatic Orrery is on the battlefield.

Cast Sewer-veillance Cam by paying .

When Sewer-veillance Cam enters, it triggers, targeting Master Transmuter.

Holding priority, activate Master Transmuter by paying , tapping it, and returning Sewer-veillance Cam from the battlefield to your hand.

When Sewer-veillance Cam leaves the battlefield, it triggers, untapping Master Transmuter.

In response to the Master Transmuter activation from step 4, activate Master Transmuter again by paying and returning the tapped Chromatic Orrery from the battlefield to your hand, putting Chromatic Orrery from your hand onto the battlefield untapped.

Resolve the remaining Master Transmuter ability, putting Sewer-veillance Cam from your hand onto the battlefield.

When Sewer-veillance Cam enters, it triggers, untapping Master Transmuter.

Activate Chromatic Orrery by tapping it, adding which you can spend to as though it were mana of any color as long as Chromatic Orrery is on the battlefield.

Repeat from step 4.

Once you have infinite mana, you may repeat the loop but activate Chromatic Orrery's last ability instead of its mana ability in step 9, drawing cards.

Infinite card draw

Infinite colored mana

Infinite colorless mana

Infinite draw triggers

Infinite artifact ETB

Infinite artifact LTB