The Locust God triggers, creating a 1/1 Insect creature token with flying and haste.
Activate Goblin Bombardment by sacrificing the Insect, dealing 1 damage to an opponent.
Niv-Mizzet triggers, causing you to draw a card.
Repeat from step 2.
This self-sustaining loop spins out of control the moment you draw a single card, thanks to The Locust God turning every card draw into a flying Insect token. You then feed that newly created token directly into Goblin Bombardment, sacrificing it to ping an opponent for 1 damage. Because that damage is noncombat damage dealt by a source you control, Niv-Mizzet, Visionary triggers to draw you another card, which restarts the entire cycle. Together, this trio creates a closed loop of continuous draws, token generation, and sacrificial damage that can easily sweep the entire table.