Urza, Chief Artificer + Time Sieve + Myr Battlesphere + Teleportation Circle

Prerequisites

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Steps

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

Effects

• Infinite turns
• Lock