Time Sieve + Mycosynth Lattice + Helm of the Host + Evangel of Heliod

Time Sieve

Mycosynth Lattice

Helm of the Host

Evangel of Heliod

How it works

1. At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Evangel of Heliod with haste.
2. The Evangel of Heliod token enters the battlefield, creating a number of 1/1 Soldier creature tokens equal to your devotion to white.
3. Activate Time Sieve by tapping it and sacrificing five creature tokens, causing you to take an extra turn after this one.
4. Repeat each turn.