Time Sieve + Mycosynth Lattice + Kiki-Jiki, Mirror Breaker + Underworld Hermit

Time Sieve

Mycosynth Lattice

Kiki-Jiki, Mirror Breaker

Underworld Hermit

How it works

1. Activate Kiki-Jiki by tapping it, creating a token copy of Underworld Hermit with haste.
2. When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
3. Activate 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. Repeat each turn.

This fascinating setup achieves infinite turns by turning your entire board into fuel for Time Sieve. The linchpin of the strategy is Mycosynth Lattice, whose passive ability makes all permanents into artifacts—meaning every creature you control suddenly becomes a valid sacrifice for Time Sieve's activation cost. Once this global rule is in place, Kiki-Jiki, Mirror Breaker repeatedly taps to duplicate Underworld Hermit. Each time the Underworld Hermit token enters, it spawns a horde of Squirrel tokens thanks to your black devotion, which Time Sieve then eagerly consumes alongside the Hermit itself to buy you another full turn.