Drafna, Founder of Lat-Nam + Voltaic Key + Chromatic Orrery

Drafna, Founder of Lat-Nam
Voltaic Key
Chromatic Orrery

Requires
Voltaic Key in hand. All other permanents on the battlefield.
Steps
  1. Activate Chromatic Orrery's first ability by tapping it, adding 5
  2. Cast Voltaic Key by paying 1
  3. Activate Voltaic Key by paying 1 and tapping it, untapping Chromatic Orrery
  4. Activate Drafna's first ability by paying 2, returning Voltaic Key from the battlefield to your hand
  5. Repeat
  6. Once you have infinite mana, you may activate Chromatic Orrery's second ability instead to draw infinite cards
Results
Infinite colored mana. Infinite colorless mana. Infinite storm count. Infinite card draw. Infinite draw triggers. Infinite untap of artifacts you control.