Mendicant Core, Guidelight + Urza, Lord High Artificer + Worldwalker Helm

Prerequisites

• You have max speed.

Steps

1. 1Cast Worldwalker Helm by paying .
2. 2Mendicant Core triggers, causing you to pay to copy the Worldwalker Helm spell.
3. 3Resolve both Worldwalker Helm spells.
4. 4Activate Urza by tapping a Worldwalker Helm, adding .
5. 5Activate a Worldwalker Helm by paying and tapping it, creating a token copy of the Worldwalker Helm token plus an additional Map token for each Worldwalker Helm you control.
6. 6Activate Urza twice by tapping two Map tokens, adding .
7. 7Repeat from step 5.

Effects

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