Sharuum the Hegemon, and Mirror of the Forebears

Prerequisites

• Sharuum the Hegemon on the battlefield
• Mirror of the Forebears on the battlefield
• "Sphinx" chosen with Mirror of the Forebears
• Sharuum is your commander
• plus enough mana to pay for commander tax available

Steps

1. Activate Mirror of the Forebears by paying , making it a copy of Sharuum
2. Put Sharuum into the graveyard due to the legend rule, returning to the command zone
3. Cast Sharuum from the command zone by paying plus commander tax
4. Sharuum dies due to the legend rule
5. Sharuum enters the battlefield triggers, returning itself from your graveyard to the battlefield
6. Repeat from step 4

Results

• Infinite ETB
• Infinite LTB