Requires

Derevi, Empyrial Tactician must be on the battlefield. Faeburrow Elder must be on the battlefield. Delney, Streetwise Lookout must be on the battlefield. Altar of Dementia must be on the battlefield. Derevi, Empyrial Tactician must be your commander. Bloom Tender does not have summoning sickness. Mana needed: if you don't control a black or red permanent

Steps

1. Activate Faeburrow Elder by tapping it, adding at least .
2. Activate Altar of Dementia by sacrificing Derevi.
3. Choose to return Derevi from your graveyard to the command zone.
4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Derevi's power.
5. Activate Derevi by paying , putting it from the command zone onto the battlefield.
6. When Derevi enters the battlefield, it triggers twice.
7. Resolve the first trigger, untapping Faeburrow Elder.
8. Activate Faeburrow Elder by tapping it, adding at least .
9. Resolve the second Derevi trigger, untapping Faeburrow Elder.
10. Repeat.
11. Once you have infinite mana, you may untap any other permanent(s) using Derevi.

Results