Urza, Lord High Artificer, Worldwalker Helm, and Echo Storm

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Worldwalker Helm on the battlefield
• Echo Storm in hand
• available

Steps

1. Cast Echo Storm by paying , creating at least one copy of Worldwalker Helm plus a Map token
2. Activate Urza's first ability twice 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 plus a Map token for each Worldwalker Helm you control
4. Activate Urza's first ability twice by tapping two Maps, adding
5. Repeat from step 3

Results

• Infinite artifact tokens
• Infinite blue mana
• Cast all spells in your library
• Infinite Map tokens
• Infinite copies of a specific artifact
• Exile your library