Derevi, Empyrial Tactician, Faeburrow Elder, Delney, Streetwise Lookout, and Phantom Train

Prerequisites

• Derevi, Empyrial Tactician on the battlefield
• Faeburrow Elder on the battlefield
• Delney, Streetwise Lookout on the battlefield
• Phantom Train on the battlefield
• if you don't control a black or red permanent available

Steps

1. Activate Faeburrow Elder by tapping it, adding at least
2. Activate Phantom Train by sacrificing Derevi
3. Choose to return Derevi from your graveyard to the command zone
4. Resolve the Phantom Train ability Activate Derevi by paying , putting it from the command zone onto the battlefield
5. When Derevi enters the battlefield, it triggers twice
6. Resolve the first trigger, untapping Faeburrow Elder
7. Activate Faeburrow Elder by tapping it, adding at least
8. Resolve the second Derevi trigger, untapping Faeburrow Elder
9. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mana permanents you control can produce
• Infinite +1/+1 counters on a creature