Prerequisites
- Emrakul, the Exigent Doom in hand or in the command zone
- Sanctum of Eternity on the battlefield
Steps
- Activate any number of lands by tapping them, adding at least
Cast Emrakul by paying 
plus commander tax if applicable - Emrakul triggers, untapping all lands you control
- Resolve Emrakul
- Then, activate Sanctum of Eternity's second ability by paying
and tapping it, returning Emrakul from the battlefield to your hand - Repeat
Results
- Infinite creature ETB
- Infinite creature LTB
- Infinite mana lands you control can produce
- Infinite storm count
- Infinite untap of lands you control
Required Cards 2
Emrakul, the Exigent Doom
Legendary Creature — Eldrazi
