How can you create a combo with Etali, Primal Conqueror // Etali, Primal Sickness, Haunted Crossroads, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Etali, Primal Conqueror // Etali, Primal Sickness, Haunted Crossroads, Phyrexian Altar

Color identity: BRG
Mana cost: {5}{R}{R}
Steps:
  1. Cast Etali by paying {5}{R}{R}.
  2. When Etali enters the battlefield, it triggers.
  3. Holding priority, activate Phyrexian Altar by sacrificing Etali, adding {B}.
  4. Activate Haunted Crossroads by paying {B}, putting Etali on top of your library from your graveyard.
  5. Resolve the Etali trigger from step 2, causing you to exile cards from each player's library until you exile a nonland card, with you exiling Etali from your library, and cast Etali and any other nonland cards exiled this way without paying their mana costs.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Cast all nonland cards from each opponent's library
  - Exile each opponent's library
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count
  - Near-infinite magecraft triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Etali, Primal Conqueror // Etali, Primal Sickness must be in your hand
  - Haunted Crossroads must be on the battlefield
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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