Ashnod's Altar + Athreos, Shroud-Veiled + Karn, the Great Creator + and 2 others

Mana needed: {U} the first turn, with {5}{U} available each extra turn

WUB identity

Commander legal

The 5 combo pieces

What must be in place

Master Transmuter does not have summoning sickness.

How to execute it

  1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Ugin's Nexus to become an artifact creature until end of turn.
  2. At the beginning of your end step, Athreos' second ability triggers, putting a coin counter on Ugin's Nexus.
  3. Activate Ashnod's Altar by sacrificing Ugin's Nexus, adding {C}{C}.
  4. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  5. Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
  6. Activate Master Transmuter by paying {U}, tapping it and returning Ugin's Nexus to your hand, choosing to not put an artifact onto the battlefield.
  7. Move to your extra turn.
  8. Cast Ugin's Nexus by paying {5}.
  9. Repeat.

What the combo produces