How can you create a combo with Dualcaster Mage, Black Sun's Twilight, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Dualcaster Mage, Black Sun's Twilight, Altar of Dementia

Color identity: BR
Mana cost: {6}{B}{R}{R}
Steps:
  1. Cast Black Sun's Twilight by paying {5}{B}, optionally choosing to target a creature.
  2. Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
  3. When Dualcaster Mage enters the battlefield, it triggers, copying Black Sun's Twilight, optionally choosing to target a creature.
  4. Holding priority, activate Altar of Dementia by sacrificing Dualcaster Mage, causing target player to mill cards equal to Dualcaster Mage's power.
  5. Resolve the copy of Black Sun's Twilight, giving up to one creature -5/-5 until end of turn and returning Dualcaster Mage from your graveyard to the battlefield.
  6. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite mill
  - Infinite self-mill
  - Infinite magecraft triggers
  - Reduce any number of target creatures' toughness to zero[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Dualcaster Mage must be in your hand
  - Black Sun's Twilight must be in your hand
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
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