Activate Yawgmoth's first ability by paying 1 life and sacrificing another creature.
When the creature dies, Funeral Room // Awakening Hall 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 engine transforms a simple sacrifice into an overwhelming cascade of card draw and insect swarms by leveraging Yawgmoth, Thran Physician to feed creatures into the meat grinder. Every time a creature hits the graveyard, Funeral Room // Awakening Hall immediately drains your opponents while offsetting Yawgmoth's life payment. Meanwhile, the mere act of drawing cards feeds right back into the board thanks to The Locust God, which instantly replaces your sacrificed fodder with fresh 1/1 flying Insect tokens ready to be sacrificed all over again.