How can you create a combo with Demon of Dark Schemes, Phyrexian Altar, Sengir Autocrat?
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[START OF COMBO]This combo can be formed with Demon of Dark Schemes, Phyrexian Altar, Sengir Autocrat

Color identity: B
Mana cost: {3}{B}
Steps:
  1. Cast Sengir Autocrat by paying {3}{B}.
  2. Sengir Autocrat enters the battlefield, creating three 0/1 Serf creature tokens.
  3. Activate Phyrexian Altar three times by sacrificing the Serf tokens, adding {2}{B}.
  4. Demon of Dark Schemes triggers three times, causing you to get {E}{E}{E}.
  5. Activate Phyrexian Altar by sacrificing Sengir Autocrat, adding one mana of any color.
  6. Demon of Dark Schemes triggers, causing you to get {E}.
  7. Activate Demon of Dark Schemes by paying {2}{B} and {E}{E}{E}{E}, putting Sengir Autocrat from your graveyard onto the battlefield tapped.
  8. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite energy counters
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Demon of Dark Schemes must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Sengir Autocrat must be in your hand
[END OF COMBO PREREQUISITES]
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