Time Sieve, Encroaching Mycosynth, Rionya, Fire Dancer, and Izoni, Thousand-Eyed

Prerequisites

• Time Sieve on the battlefield
• Encroaching Mycosynth on the battlefield
• Rionya, Fire Dancer on the battlefield
• Izoni, Thousand-Eyed on the battlefield
• You have at least five creature cards in your graveyard

Steps

1. At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Izoni with haste
2. Put the token Izoni into your graveyard due to the legend rule
3. The Izoni token enters-the-battlefield ability triggers, creating at least five 1/1 Insect creature tokens
4. Activate Time Sieve by tapping it and sacrificing the Insect tokens, causing you to take an extra turn after this one
5. Repeat each turn

Results

• Infinite turns