How can you create a combo with Memnite, Tempered Steel, Altar of Dementia, Underworld Breach, Thassa's Oracle?
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[START OF COMBO]This combo can be formed with Memnite, Tempered Steel, Altar of Dementia, Underworld Breach, Thassa's Oracle

Color identity: URW
Mana cost: {1}{U}{U}{R}
Steps:
  1. Cast Underworld Breach.
  2. Activate Altar of Dementia by sacrificing Memnite, milling yourself for three.
  3. Cast Memnite by exiling three cards from your graveyard that are not Thassa's Oracle.
  4. Repeat steps 2 and 3 until you have no cards in library.
  5. Cast Thassa's Oracle.
  6. Resolve its enter the battlefield trigger.[END OF COMBO STEPS]

Result:
  - Infinite self-mill
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite sacrifice triggers
  - Win the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Memnite must be on the battlefield
  - Tempered Steel must be on the battlefield
  - Altar of Dementia must be on the battlefield
  - Underworld Breach must be in your hand
  - Thassa's Oracle must be in the library
  - You have four or more cards in your graveyard.
[END OF COMBO PREREQUISITES]
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