Mishra, Eminent One + Urza, Lord High Artificer + Worldwalker Helm + Fires of Yavimaya

Mishra, Eminent One

Urza, Lord High Artificer

Worldwalker Helm

Fires of Yavimaya

How it works

1. At 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. Activate Urza's first ability by tapping a Map, adding .
3. Activate Mishra's Warform by paying 1 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. Activate Urza's first ability twice by tapping two Maps, adding .
5. Repeat from step 3.

This clever loop turns the combat step into an engine by using Mishra, Eminent One to forge a temporary, 4/4 copy of Worldwalker Helm—complete with the haste granted by Fires of Yavimaya. Worldwalker Helm's replacement effect doubles every artifact token you create, while Urza, Lord High Artificer acts as the mana engine by turning your newly generated Map tokens into blue mana. By sinking that mana back into Worldwalker Helm's activated ability, you exponentially multiply your copies of the Helm and your map stash, ultimately fueling Urza's mana sink to exile and cast your entire library.