Defiler of Faith + Oketra's Monument + Whitemane Lion + Lifecreed Duo

Defiler of Faith

Oketra's Monument

Whitemane Lion

Lifecreed Duo

How it works

1. Cast Whitemane Lion by paying 0 and 2 life due to Defiler of Faith and Oketra's Monument.
2. Defiler of Faith and Oketra's Monument trigger.
3. Resolve the Defiler of Faith trigger, creating a 1/1 Soldier creature token.
4. When the Soldier enters, Lifecreed Duo triggers, causing you to gain life.
5. Resolve the Oketra's Monument trigger, creating a 1/1 Warrior creature token.
6. When the Warrior enters, Lifecreed Duo triggers, causing you to gain life.
7. Resolve Whitemane Lion. When it enters, it and Lifecreed Duo trigger.
8. Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand.
9. Resolve the Lifecreed Duo trigger, causing you to gain life.
10. Repeat.

This clever loop hinges on reducing Whitemane Lion's mana cost down to zero using the cost-reducing synergy of Defiler of Faith and Oketra's Monument. Because the Lion can repeatedly return itself to your hand upon entering the battlefield, you can recast it endlessly without running out of mana. Meanwhile, Lifecreed Duo transforms that perpetual motion into a flurry of lifegain whenever the Lion or the token creatures produced by Defiler of Faith and Oketra's Monument enter the battlefield.