Cast Kor Skyfisher by paying 0 and 2 life due to Defiler of Faith and Oketra's Monument.
Defiler of Faith and Oketra's Monument trigger.
Resolve the Defiler of Faith trigger, creating a 1/1 Soldier creature token.
When the Soldier enters, Case of the Uneaten Feast triggers, causing you to gain life.
Resolve the Oketra's Monument trigger, creating a 1/1 Warrior creature token.
When the Warrior enters, Case of the Uneaten Feast triggers, causing you to gain life.
Resolve Kor Skyfisher. When it enters, it and Case of the Uneaten Feast trigger.
Resolve the Kor Skyfisher trigger, returning it from the battlefield to your hand.
Resolve the Case of the Uneaten Feast trigger, causing you to gain life.
Repeat.
This loop transforms the humble Kor Skyfisher into a self-sustaining engine of creation by leaning on massive cost-reduction synergies. With Defiler of Faith and Oketra's Monument both lowering the creature's casting cost to zero while paying life, you can replay the Skyfisher indefinitely while flooding the board with Soldier and Warrior tokens. Every time those tokens enter the battlefield, Case of the Uneaten Feast triggers to replenish your life total, turning the life spent on your casts into a net gain while easily solving the Case to unlock graveyard casting if needed.