Time Sieve + Myr Battlesphere + Teleportation Circle + Karn, Living Legacy

Prerequisites

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Steps

1. 1Activate Karn's first loyalty ability by putting a loyalty counter on it, creating a tapped Powerstone artifact token.
2. 2At the beginning of your end step, Teleportation Circle triggers, blinking Myr Battlesphere.
3. 3When Myr Battlesphere enters the battlefield, its first ability triggers, creating four 1/1 Myr artifact creature tokens.
4. 4Activate Time Sieve by tapping it and sacrificing the Myrs and Powerstone, causing you to take an extra turn after this one.
5. 5Repeat each turn.

Effects

• Infinite turns
• Lock