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

U identity

Commander legal

The 4 combo pieces

What must be in place

You control a Thopter.

How to execute it

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

What the combo produces