Retrofitter Foundry, Stridehangar Automaton, Urza, Lord High Artificer, and Peregrin Took

Prerequisites

• Retrofitter Foundry on the battlefield
• Stridehangar Automaton on the battlefield
• Urza, Lord High Artificer on the battlefield
• Peregrin Took on the battlefield

Steps

1. Activate Retrofitter Foundry's fourth ability by tapping it and sacrificing a Thopter, creating a 4/4 Construct artifact creature token, a 1/1 Thopter artifact creature token, and a Food token
2. Activate Urza's first ability three times by tapping the Thopter, Construct and Food, adding
3. Activate Retrofitter Foundry's first ability by paying , untapping it
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite card draw
• Infinite death triggers
• Infinite draw triggers
• Infinite sacrifice triggers
• Infinite tapped Food tokens
• Infinite tapped creature tokens