Derevi, Empyrial Tactician, Emiel the Blessed, and Mana Vault

Prerequisites

• Derevi, Empyrial Tactician on the battlefield
• Emiel the Blessed on the battlefield
• Mana Vault on the battlefield

Steps

1. Activate Mana Vault by tapping it, adding
2. Activate Emiel by paying , blinking Derevi
3. When Derevi enters the battlefield, it triggers, untapping Mana Vault
4. Repeat

Results

• Infinite LTB
• Infinite ETB