Krark-Clan Ironworks + The Sixth Doctor + Ugin's Nexus + Vedalken Mastermind

Mana needed: {5}{U} each turn

GU identity

Commander legal

The 4 combo pieces

What must be in place

Vedalken Mastermind does not have summoning sickness.

How to execute it

  1. Cast Ugin's Nexus by paying {5}.
  2. The Sixth Doctor triggers, copying the Ugin's Nexus spell, with the copy being nonlegendary.
  3. Resolve both Ugin's Nexus spells.
  4. Activate Vedalken Mastermind by paying {U} and tapping it, returning the nontoken Ugin's Nexus to your hand.
  5. Activate Krark-Clan Ironworks by sacrificing the Ugin's Nexus token, adding {C}{C}.
  6. The Ugin's Nexus token is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  7. Repeat each turn.

What the combo produces