Color Identity: G

Initial Card State
- All permanents on the battlefield.
Mana Needed
- ({2} magic symbol)
on the first turn, with ({7} magic symbol)
available each subsequent 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, and causes you to take an extra turn after this one.
- Activate The Chain Veil by paying ({4} magic symbol)
and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn. - 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.
- Activate Karn's second loyalty ability by removing two loyalty counters from it, revealing Ugin's Nexus from exile and putting it into your hand.
- Move to your next turn.
- Cast Ugin's Nexus by paying ({5} magic symbol)
. - Repeat.
Bracket Tag
This combo has been estimated to be Ruthless (Bracket 4+).