Activate Yawgmoth's first ability by paying 1 life and sacrificing another creature.
When the creature dies, Cruel Celebrant triggers, causing you to gain 1 life and each opponent to lose 1 life.
Resolve the Yawgmoth ability, causing you to draw a card and allowing you to put a -1/-1 counter on up to one creature.
The Locust God triggers, creating a 1/1 Insect creature token with flying and haste.
Repeat.
This elegant loop relies on Yawgmoth, Thran Physician as your engine, using his activated ability to sacrifice a creature while offsetting the life cost through Cruel Celebrant's life-draining drain triggers. Every card drawn from Yawgmoth's sacrifice conveniently feeds The Locust God, which instantly replaces your spent minion with a flying Insect token ready to be sacrificed back into the machine. Together, these pieces turn a single sacrifice into a self-sustaining cascade of card draw, life manipulation, and token generation that can easily overwhelm your opponents.