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

Time Sieve

Encroaching Mycosynth

Rionya, Fire Dancer

Izoni, Thousand-Eyed

How it works

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.

This loop turns your combat step into an endless succession of extra turns by weaponizing the legend rule and a clever type-shifting engine. Encroaching Mycosynth is the glue that holds everything together, turning every nonland permanent you control—including the Insect tokens and Izoni, Thousand-Eyed herself—into artifacts. This transformation allows Time Sieve to greedily gobble up those tokens as part of its artifact-sacrificing cost to buy you infinite turns. Meanwhile, Rionya, Fire Dancer sets the whole show in motion by repeatedly conjuring fresh copies of Izoni, Thousand-Eyed, whose entry triggers flood the board with the exact fodder Time Sieve needs to feast.