Defiler of Faith + Auriok Champion + Whitemane Lion + Grand Arbiter Augustin IV

Defiler of Faith

Auriok Champion

Whitemane Lion

Grand Arbiter Augustin IV

How it works

1. Cast Whitemane Lion by paying 0 and 2 life due to Defiler of Faith and Grand Arbiter Augustin IV.
2. Defiler of Faith triggers, creating a 1/1 Soldier creature token.
3. When the Soldier enters, Auriok Champion triggers, causing you to gain life.
4. Resolve Whitemane Lion. When it enters, it and Auriok Champion trigger.
5. Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand.
6. Resolve the Auriok Champion trigger, causing you to gain life.
7. Repeat.

This loop relies on cost-reducers and self-bouncing synergy to generate an endless cycle of creature tokens and life. With Grand Arbiter Augustin IV reducing white spells by {1} and Defiler of Faith allowing you to pay 2 life instead of {W}, you can cast Whitemane Lion entirely for free. As Whitemane Lion enters the battlefield, its triggered ability forces it to return itself to your hand, while Defiler of Faith rewards you by spawning a 1/1 Soldier creature token. Every time that token enters, Auriok Champion triggers to replenish your life total, creating an unstoppable engine of infinite entry triggers and lifegain.