Carth the Lion + Karn, the Great Creator + Ugin's Nexus + The Chain Veil + Krark-Clan Ironworks

Carth the Lion

Karn, the Great Creator

Ugin's Nexus

The Chain Veil

Krark-Clan Ironworks

How it works

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