How can you create a combo with Urza, Lord High Artificer, Worldwalker Helm, Artificer Class?
user
[START OF COMBO]This combo can be formed with Urza, Lord High Artificer, Worldwalker Helm, Artificer Class

Color identity: U
Mana cost: 
Steps:
  1. At the beginning of your end step, Artificer Class's third ability triggers, creating a token copy of Worldwalker Helm and a Map token.
  2. Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding {U}{U}.
  3. Activate a Worldwalker Helm by paying {1}{U} and tapping it, creating a token copy of the Worldwalker Helm token and two Map tokens.
  4. Activate Urza's first ability twice by tapping the Maps, adding {U}{U}.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite tapped Map tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant