Color Identity: U

Initial Card State
- All permanents on the battlefield.
Notable Prerequisites
- Karn has at least three loyalty counters.
Mana Needed
- ({5} magic symbol)
on each extra turn available.
Steps
- Activate Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding ({C} magic symbol)
({C} magic symbol)
. - Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
- Activate Karn's second ability by removing two loyalty counters from it, putting Ugin's Nexus into your hand from exile.
- Move to your next turn.
- Cast Ugin's Nexus by paying ({5} magic symbol)
. - Displacer Kitten triggers, blinking Karn.
- Repeat.
Bracket Tag
This combo has been estimated to be Ruthless (Bracket 4+).