You have at least eight permanent cards in your graveyard.
Your life total is at least 2.
You control at least one additional creature.
Steps
Activate Yawgmoth's first ability by paying 1 life and sacrificing another creature, causing you to draw a card and allowing you to put a -1/-1 counter on up to one creature.
The Locust God and Starving Revenant trigger.
Resolve the Locust God trigger, creating a 1/1 Insect creature token with flying and haste.
Resolve the Starving Revenant trigger, causing you to gain 1 life and an opponent to lose 1 life.