Cast Kor Skyfisher by paying 0 and 2 life due to Defiler of Faith and Pearl Medallion.
Defiler of Faith triggers, creating a 1/1 Soldier creature token.
When the Soldier enters, Guide of Souls triggers, causing you to gain life and get E
Resolve Kor Skyfisher. When it enters, it and Guide of Souls trigger.
Resolve the Kor Skyfisher trigger, returning it from the battlefield to your hand.
Resolve the Guide of Souls trigger, causing you to gain life and get E
Repeat.
This clever loop relies on stacking cost reductions from Pearl Medallion and Defiler of Faith to cast Kor Skyfisher entirely for free by paying 2 life, turning every iteration into a zero-mana engine. As Kor Skyfisher bounces itself back to your hand upon entering the battlefield, Defiler of Faith capitalizes on the cast to continuously spawn 1/1 Soldier creature tokens. Those tokens entering the battlefield trigger Guide of Souls to steadily fuel your energy reserves and pad your life total.