How can you create a combo with Phantom Steed, Karmic Guide, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Phantom Steed, Karmic Guide, Phyrexian Altar

Color identity: WU
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Phantom Steed, adding one mana of any color.
  2. Phantom Steed leaves the battlefield, returning Karmic Guide from exile to the battlefield.
  3. Karmic Guide enters the battlefield, returning Phantom Steed from your graveyard to the battlefield.
  4. Phantom Steed enters the battlefield, exiling Karmic Guide until Phantom Steed leaves the battlefield.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - 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:
  - Phantom Steed must be on the battlefield
  - Karmic Guide must be exiled
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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