Karn, the Great Creator + Ugin's Nexus + Throne of Geth + The Chain Veil

Prerequisites

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Steps

1. 1Activate The Chain Veil by paying and tapping it, allowing an extra activation of your planeswalkers' abilities this turn.
2. 2Activate Throne of Geth by tapping it and sacrificing Ugin's Nexus.
3. 3Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
4. 4Resolve the Throne of Geth ability, putting a loyalty counter on Karn.
5. 5Activate Karn's first loyalty ability by putting a loyalty counter on it, causing a noncreature artifact to become an artifact creature until end of turn.
6. 6Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
7. 7Move to your next turn.
8. 8Cast Ugin's Nexus by paying .
9. 9Repeat.

Effects

• Infinite turns
• Lock