How can you create a combo with Kaya's Ghostform, Phyrexian Altar, Trusty Retriever?
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[START OF COMBO]This combo can be formed with Kaya's Ghostform, Phyrexian Altar, Trusty Retriever

Color identity: WB
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Trusty Retriever, adding {B}.
  2. When Trusty Retriever dies, Kaya's Ghostform triggers, returning Trusty Retriever from your graveyard to the battlefield.
  3. When Trusty Retriever enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to your hand.
  4. Cast Kaya's Ghostform by paying {B}, attaching it to Trusty Retriever.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - 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
  - Kaya's Ghostform attached to Trusty Retriever.
[END OF COMBO PREREQUISITES]
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