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

Color identity: U
Mana cost: {3}{U}{U}
Steps:
  1. Cast Worldwalker Helm by paying {2}{U}.
  2. When Worldwalker Helm enters the battlefield, Replication Specialist triggers, causing you to pay {1}{U} to create a token copy of Worldwalker Helm and a Map token.
  3. Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding {U}{U}.
  4. Activate a Worldwalker Helm by paying {1}{U} and tapping it, creating a token copy of the Worldwalker Helm token and two Map tokens.
  5. Activate Urza's first ability twice by tapping the Maps, adding {U}{U}.
  6. Repeat from step 4.[END OF COMBO STEPS]

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

Other prerequisites:
  - Urza, Lord High Artificer must be on the battlefield
  - Worldwalker Helm must be in your hand
  - Replication Specialist must be on the battlefield
[END OF COMBO PREREQUISITES]
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