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

Color identity: UB
Mana cost: 
Steps:
  1. Declare Skullsnatcher as an attacker.
  2. When it isn't blocked, activate up to seven lands you control by tapping them, adding at least {2}{U}{B}{B}.
  3. Activate Great Whale's ninjutsu ability by paying {2}{U}{B} and returning Skullsnatcher 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 Skullsnatcher's ninjutsu ability by paying {B} and returning Great Whale from the battlefield to your hand, putting Skullsnatcher 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 {3}{U}{B}{B}, this combo nets infinite mana.[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
  - Great Whale must be in your hand
  - Skullsnatcher must be on the battlefield
  - Skullsnatcher 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 {2}{U}{B}{B}.
[END OF COMBO PREREQUISITES]
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