Mishra, Eminent One + Urza, Lord High Artificer + Worldwalker Helm + Alibou, Ancient Witness

Prerequisites

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Steps

1. 1At the beginning of your combat phase, Mishra triggers, creating a token copy of Worldwalker Helm that is a 4/4 Construct artifact creature with haste named Mishra's Warform, and a Map token.
2. 2Activate Urza's first ability by tapping a Map, adding .
3. 3Activate Mishra's Warform by paying and tapping it, creating a token copy of it and a Map token for each Mishra's Warform and/or Worldwalker Helm you control.
4. 4Activate Urza's first ability twice by tapping two Maps, adding .
5. 5Repeat from step 3.

Effects

• Cast all spells in your library
• Exile your library
• Infinite artifact tokens
• Infinite blue mana
• Infinite creature ETB
• Infinite Map tokens
• Infinite tapped creature tokens