How can you create a combo with Derevi, Empyrial Tactician, Empowered Autogenerator, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Derevi, Empyrial Tactician, Empowered Autogenerator, Phyrexian Altar

Color identity: GWU
Mana cost: {U}
Steps:
  1. Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding {G}, {W} or {U} for each charge counter on it.
  2. Activate Phyrexian Altar by sacrificing Derevi, adding {G}, {W} or {U}.
  3. Choose to have Derevi returned to the command zone from your graveyard.
  4. Activate Derevi by paying {1}{G}{W}{U}, putting it onto the battlefield from the command zone.
  5. Derevi enters the battlefield, untapping Empowered Autogenerator.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Empowered Autogenerator has at least two charge counters on it.
  - {G}, {W} or
[END OF COMBO PREREQUISITES]
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