How can you create a combo with Yarok, the Desecrated, Peregrine Drake, Cavern Harpy?
user
[START OF COMBO]This combo can be formed with Yarok, the Desecrated, Peregrine Drake, Cavern Harpy

Color identity: BGU
Mana cost: {1}
Steps:
  1. Activate up to five lands you control by tapping them, adding at least {2}{U}{B}.
  2. Cast Peregrine Drake by paying {4}{U}.
  3. Peregrine Drake enters the battlefield, triggering its ability twice.
  4. Resolve the first Peregrine Drake trigger, untapping the five lands.
  5. Activate the five lands by tapping them, adding at least {2}{U}{B}.
  6. Resolve the second Peregrine Drake trigger, untapping the five lands.
  7. Cast Cavern Harpy by paying {U}{B}.
  8. Cavern Harpy enters the battlefield, triggering its ability twice, returning Cavern Harpy and Peregrine Drake from the battlefield to your hand.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - 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:
  - Yarok, the Desecrated must be on the battlefield
  - Peregrine Drake must be in your hand
  - Cavern Harpy must be in your hand
  - You control up to five lands that can tap to produce at least {2}{U}{B}.
[END OF COMBO PREREQUISITES]
assistant