How can you create a combo with Satoru Umezawa, Peregrine Drake, Great Whale?
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[START OF COMBO]This combo can be formed with Satoru Umezawa, Peregrine Drake, Great Whale

Color identity: UB
Mana cost: 
Steps:
  1. Declare Great Whale as an attacker.
  2. When Great Whale is unblocked, activate up to five lands you control by tapping them, adding at least {3}{U}{B}.
  3. Activate Peregrine Drake's ninjitsu ability by paying {2}{U}{B} and returning Great Whale from the battlefield to your hand, putting Peregrine Drake from your hand onto the battlefield tapped and attacking.
  4. Peregrine Drake enters the battlefield, untapping up to five lands.
  5. Activate up to five lands you control by tapping them, adding at least {3}{U}{B}.
  6. Activate Great Whale's ninjitsu ability by paying {2}{U}{B} and returning Peregrine Drake from the battlefield to your hand, putting Great Whale from your hand onto the battlefield tapped and attacking.
  7. Great Whale enters the battlefield, untapping up to seven lands.
  8. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Satoru Umezawa must be on the battlefield
  - Peregrine Drake must be in your hand
  - Great Whale must be on the battlefield
  - Great Whale does not have summoning sickness and cannot be blocked and killed by an opponent.
  - You control up to five lands that can tap to produce at least {3}{U}{B}.
[END OF COMBO PREREQUISITES]
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