Urza, Lord High Artificer, Worldwalker Helm, and Court of Vantress

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Worldwalker Helm on the battlefield
• Court of Vantress on the battlefield
• You are the monarch

Steps

1. At the beginning of your upkeep, Court of Vantress triggers, creating a token copy of Worldwalker Helm and a Map token
2. Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding
3. Activate a Worldwalker Helm by paying and tapping it, creating a token copy of the Worldwalker Helm token and two Map tokens
4. Activate Urza's first ability twice by tapping the Maps, adding
5. Repeat from step 3

Results

• Infinite tapped Map tokens