How can you create a combo with Dual Nature, Faerie Impostor, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Dual Nature, Faerie Impostor, Phyrexian Altar

Color identity: GU
Mana cost: {U}
Steps:
  1. Cast Faerie Impostor by paying {U}.
  2. Faerie Impostor and Dual Nature's first ability trigger.
  3. Resolve the Dual Nature ability, creating a token copy of Faerie Impostor.
  4. The Faerie Impostor token triggers, returning the nontoken Faerie Impostor from the battlefield to your hand.
  5. Dual Nature's second ability triggers.
  6. In response, sacrifice the token Faerie Impostor to Phyrexian Altar for {U}.
  7. Resolve the Dual Nature ability, exiling zero creatures.
  8. Resolve the Faerie Impostor ability, returning a creature you control from the battlefield to your hand if desired.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count
  - Return any number of creatures you control to your hand[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Dual Nature must be on the battlefield
  - Faerie Impostor must be in your hand
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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