March of the Machines, Fecundity, Dross Scorpion, and The Underworld Cookbook

Prerequisites

• March of the Machines on the battlefield
• Fecundity on the battlefield
• Dross Scorpion on the battlefield
• The Underworld Cookbook on the battlefield

Steps

1. Activate The Underworld Cookbook's first ability by tapping it and discarding a card, creating a Food artifact token
2. The Food enters the battlefield as a 0/0 artifact creature and dies as a state-based action due to having zero or less toughness
3. Dross Scorpion and Fecundity triggers
4. Resolve the Dross Scorpion trigger, untapping The Underworld Cookbook
5. Resolve the Fecundity trigger, causing you to draw a card
6. Repeat

Results

• Infinite death triggers
• Infinite draw triggers
• Infinite ETB
• Infinite looting
• Infinite LTB
• Infinite self-discard triggers