The Locust God triggers, creating a 1/1 Insect creature token with flying and haste.
The Insect enters the battlefield, triggering Witty Roastmaster, dealing 1 damage to each opponent.
Snake Umbra triggers, causing you to draw a card.
Repeat from step 2.
By enchanting The Locust God with Snake Umbra, you create a self-sustaining engine where every card drawn spawns a flying Insect token, which in turn triggers Snake Umbra's granted ability to draw you another card upon dealing damage. Adding Witty Roastmaster to the board transforms this endless loop of drawing and token creation into a lethal storm, as its Alliance ability pings each opponent for 1 damage every time an Insect enters the battlefield.