Retrofitter Foundry + Stridehangar Automaton + Urza, Lord High Artificer + Worldwalker Helm

Prerequisites

• You control a Thopter.

Steps

1. 1Activate 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 Map token.
2. 2Activate Urza's first ability three times by tapping the Thopter, Construct and Map, adding .
3. 3Activate Retrofitter Foundry's first ability by paying , untapping it.
4. 4Repeat.

Effects

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite tapped creature tokens
• Infinite tapped Map tokens