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

Color identity: U
Mana cost: 
Steps:
  1. Cast Echo Storm by paying {3}{U}{U}.
  2. Echo Storm triggers, copying it for each time you've cast your commander from the command zone this game.
  3. Resolve all Echo Storms, creating a token copy of Worldwalker Helm and a Map token for each Echo Storm.
  4. Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding {U}{U}.
  5. Activate a Worldwalker Helm by paying {1}{U} and tapping it, creating a token copy of the Worldwalker Helm token and a number of Map tokens equal to one plus the number of Worldwalker Helms you control as you resolve this ability.
  6. Activate Urza's first ability twice by tapping two Maps, adding {U}{U}.
  7. Repeat from step 5.[END OF COMBO STEPS]

Result:
  - Infinite blue mana
  - Cast all cards in your library without paying their mana costs
  - Infinite Map tokens
  - Infinite Worldwalker Helm tokens[END OF COMBO RESULT][END OF COMBO]

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