By turning every creature on the battlefield black with Darkest Hour, we establish a recursive loop centered around Ayara, First of Locthwain equipped with a Thornbite Staff. When you tap Ayara to sacrifice a creature to her activated ability, Thornbite Staff sees that death and immediately untaps her. Meanwhile, drawing a card from Ayara's sacrifice triggers The Locust God to spawn a 1/1 flying Insect token. Because Darkest Hour ensures that newly created token is black, Ayara's entry triggers both herself and the Staff's auto-attach ability, getting the equipment right back onto Ayara so you can repeat the process indefinitely for an unstoppable cascade of card draw, drains, and insect tokens.