Altar of Dementia + Ugin's Nexus Combos

2 known combos featuring both cards in Commander

Infinite turns Lock

Combo 1 with Kaya the Inexorable + Karn, the Great Creator

Results: Infinite turns · Lock
Steps
  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. Activate Kaya's first loyalty ability by putting a loyalty counter on it, putting a ghostform counter on Ugin's Nexus.
  3. Activate Altar of Dementia by sacrificing Ugin's Nexus.
  4. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  5. Ugin's Nexus triggers, returning itself from exile to your hand, and creating a 1/1 Spirit creature token.
  6. Resolve the Altar of Dementia ability from step 3, causing target player to mill cards equal to Ugin's Nexus' power.
  7. Move to your next turn.
  8. Cast Ugin's Nexus by paying {5}.
  9. Repeat.

Combo 2 with Toph, the First Metalbender + Meticulous Excavation

Results: Infinite turns · Lock
Show steps
  1. Cast Ugin's Nexus by paying {5}.
  2. At the beginning of your end step, Toph triggers, causing Ugin's Nexus to become an artifact land creature.
  3. Activate Altar of Dementia by sacrificing Ugin's Nexus. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  4. Toph triggers, returning Ugin's Nexus from exile to the battlefield.
  5. Resolve the Altar of Dementia ability.
  6. Activate Meticulous Excavation by paying {2}{W}, returning Ugin's Nexus from the battlefield to your hand.
  7. Repeat each turn.
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