Carth the Lion + Karn, the Great Creator + Ugin's Nexus + The Chain Veil + Phyrexian Altar

Prerequisites

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Steps

1. 1Activate Karn's first loyalty ability by putting two loyalty counters on it, causing Ugin's Nexus to become an artifact creature until end of turn.
2. 2Activate Phyrexian Altar by exiling Ugin's Nexus, adding .
3. 3Ugin's Nexus triggers, causing you to take an extra turn after this one.
4. 4Activate The Chain Veil by paying and tapping it, allowing you to activate all planeswalker abilities an extra time this turn.
5. 5Activate Karn's second loyalty ability by removing a loyalty counter from it, returning Ugin's Nexus from exile to your hand.
6. 6Move to your next turn.
7. 7Cast Ugin's Nexus by paying .
8. 8Repeat.

Effects

• Infinite turns
• Lock