How can you create a combo with Urza, Chief Artificer, Time Sieve, Myr Battlesphere, Teleportation Circle?
user
[START OF COMBO]This combo can be formed with Urza, Chief Artificer, Time Sieve, Myr Battlesphere, Teleportation Circle

Color identity: WUB
Mana cost: 
Steps:
  1. At the beginning of your end step, Teleportation Circle and Urza trigger.
  2. Resolve the Urza trigger, creating a 0/0 Construct creature token.
  3. Resolve the Teleportation Circle trigger, blinking Myr Battlesphere.
  4. When Myr Battlesphere enters the battlefield, its first ability triggers, creating four 1/1 Myr artifact creature tokens.
  5. Activate Time Sieve by tapping it and sacrificing the Myrs and Construct, causing you to take an extra turn after this one.
  6. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

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