Defiler of Faith + The Wind Crystal + Ajani's Welcome + Kor Skyfisher

Defiler of Faith

The Wind Crystal

Ajani's Welcome

Kor Skyfisher

How it works

1. Cast Kor Skyfisher by paying 0 and 2 life due to Defiler of Faith and The Wind Crystal.
2. Defiler of Faith triggers, creating a 1/1 Soldier creature token.
3. When the Soldier enters, Ajani's Welcome triggers, causing you to gain life.
4. Resolve Kor Skyfisher. When it enters, it and Ajani's Welcome trigger.
5. Resolve the Kor Skyfisher trigger, returning it from the battlefield to your hand.
6. Resolve the Ajani's Welcome trigger, causing you to gain life.
7. Repeat.

This clever loop centers around Kor Skyfisher returning itself to your hand, but it only works because cost-reducers and life-doublers completely rewrite the math of your spells. Thanks to The Wind Crystal and Defiler of Faith, you can cast Kor Skyfisher for free by trading life instead of mana, while Defiler of Faith simultaneously floods the board with 1/1 Soldier tokens every time you cast a white permanent. As those tokens enter, Ajani's Welcome triggers to gain you life, which The Wind Crystal turns into an even larger life cushion to sustain the life-payment costs indefinitely.