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

Color identity: UB
Mana cost: 
Steps:
  1. Declare Throat Slitter as an attacker.
  2. When it isn't blocked, activate up to seven lands you control by tapping them, adding at least {4}{U}{U}{B}.
  3. Activate Great Whale's ninjutsu ability by paying {2}{U}{B} and returning Throat Slitter from the battlefield to your hand, putting Great Whale onto the battlefield from your hand tapped and attacking.
  4. When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
  5. Activate Throat Slitter's ninjutsu ability by paying {2}{B} and returning Great Whale from the battlefield to your hand, putting Throat Slitter onto the battlefield from your hand tapped and attacking.
  6. Repeat from step 2.
  7. If you control up to seven lands that can tap to produce at least {5}{U}{B}{B}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Satoru Umezawa must be on the battlefield
  - Great Whale must be in your hand
  - Throat Slitter must be on the battlefield
  - Throat Slitter does not have summoning sickness and cannot be blocked by an opponent.
  - You control up to seven lands that can tap to produce at least {4}{U}{B}{B}.
[END OF COMBO PREREQUISITES]
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