Urza, Lord High Artificer + Worldwalker Helm + Mirrorworks

Prerequisites

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Steps

1. 1Cast Worldwalker Helm by paying .
2. 2When Worldwalker Helm enters the battlefield, Mirrorworks triggers, causing you to pay to create a token copy of Worldwalker Helm and a Map token.
3. 3Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding .
4. 4Activate a Worldwalker Helm by paying and tapping it, creating a token copy of the Worldwalker Helm token and a Map token for each Worldwalker Helm you control.
5. 5Activate Urza's first ability twice by tapping two Maps, adding .
6. 6Repeat from step 4.

Effects

• Cast all spells in your library
• Exile your library
• Infinite blue mana
• Infinite Map tokens