How can you create a combo with Donal, Herald of Wings, Cloudstone Curio, Peregrine Drake?
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[START OF COMBO]This combo can be formed with Donal, Herald of Wings, Cloudstone Curio, Peregrine Drake

Color identity: U
Mana cost: {4}{U}
Steps:
  1. Cast Peregrine Drake by paying {4}{U}.
  2. Donal triggers, creating a copy of the Peregrine Drake spell that is a 1/1 Spirit in addition to its other types.
  3. The copy of Peregrine Drake enters the battlefield, triggering itself and Cloudstone Curio.
  4. Resolve the Peregrine Drake trigger, untapping up to five lands that can tap to produce at least {3}{U}{U}.
  5. Resolve the Cloudstone Curio trigger, returning Donal from the battlefield to your hand.
  6. Activate five lands by tapping them, adding at least {3}{U}{U}.
  7. Resolve the original Peregrine Drake spell from step 1.
  8. Peregrine Drake enters the battlefield, triggering itself and Cloudstone Curio.
  9. Resolve the Peregrine Drake trigger, untapping up to five lands that can tap to produce {3}{U}{U}.
  10. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand.
  11. Cast Donal by paying {2}{U}{U}.
  12. Donal enters the battlefield, triggering Cloudstone Curio, returning Peregrine Drake from the battlefield to your hand.
  13. Activate five lands by tapping them, adding at least {3}{U}{U}.
  14. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Donal, Herald of Wings must be on the battlefield
  - Cloudstone Curio must be on the battlefield
  - Peregrine Drake must be in your hand
  - You control up to five lands that can tap to produce at least {3}{U}{U}.
  - You have not copied a spell with Donal this turn.
[END OF COMBO PREREQUISITES]
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