Time Sieve + Mycosynth Lattice + Rionya, Fire Dancer + Underworld Hermit

Prerequisites

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Steps

1. 1At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Underworld Hermit with haste.
2. 2When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
3. 3Activate Time Sieve by tapping it, sacrificing the Underworld Hermit token and the Squirrel tokens, causing you to take an extra turn after this one.
4. 4Repeat each turn.

Effects

• Infinite turns
• Lock