Declare Great Whale and Prosperous Thief as attackers.
When they aren't blocked, activate up to seven lands you control by tapping them, adding at least {3}{U}{U}{U}.
Activate Thousand-Faced Shadow's ninjutsu ability by paying {2}{U}{U} and returning Prosperous Thief from the battlefield to your hand, putting Thousand-Faced Shadow onto the battlefield from your hand tapped and attacking.
When Thousand-Faced Shadow enters the battlefield, it triggers, creating a token copy of Great Whale that is tapped and attacking.
When the Great Whale token enters the battlefield, it triggers, untapping up to seven lands.
Activate Prosperous Thief's ninjutsu ability by paying {1}{U} and returning Thousand-Faced Shadow from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
Deal combat damage using the Great Whale tokens, dealing infinite combat damage to the defending opponent.
If you control up to seven lands that can tap to produce at least {4}{U}{U}{U}, this combo nets infinite mana.

Infinite combat damage to one opponent

Infinite creature tokens

Infinite ETB

Infinite LTB

Infinite mana lands you control can produce

Infinite untap of lands you control

Thousand-Faced Shadow

Great Whale

Prosperous Thief

Declare Prosperous Thief as an attacker.
When it isn't blocked, activate up to seven lands you control by tapping them, adding at least {3}{U}{U}{B}.
Activate Great Whale's ninjutsu ability by paying {2}{U}{B} and returning Prosperous Thief from the battlefield to your hand, putting Great Whale onto the battlefield from your hand tapped and attacking.
When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
Activate Prosperous Thief's ninjutsu ability by paying {1}{U} and returning Great Whale from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
If you control up to seven lands that can tap to produce at least {4}{U}{U}{B}, this combo nets infinite mana.

Satoru Umezawa

Declare Palinchron and Prosperous Thief as attackers.
When they aren't blocked, activate up to seven lands you control by tapping them, adding at least {3}{U}{U}{U}.
Activate Thousand-Faced Shadow's ninjutsu ability by paying {2}{U}{U} and returning Prosperous Thief from the battlefield to your hand, putting Thousand-Faced Shadow onto the battlefield from your hand tapped and attacking.
When Thousand-Faced Shadow enters the battlefield, it triggers, creating a token copy of Palinchron that is tapped and attacking.
When the Palinchron token enters the battlefield, it triggers, untapping up to seven lands.
Activate Prosperous Thief's ninjutsu ability by paying {1}{U} and returning Thousand-Faced Shadow from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
Deal combat damage using the Palinchron tokens, dealing infinite combat damage to the defending opponent.
If you control up to seven lands that can tap to produce at least {4}{U}{U}{U}, this combo nets infinite mana.

Palinchron

Declare Prosperous Thief as an attacker.
When it isn't blocked, activate up to seven lands you control by tapping them, adding at least {3}{U}{U}{B}.
Activate Palinchron's ninjutsu ability by paying {2}{U}{B} and returning Prosperous Thief from the battlefield to your hand, putting Palinchron onto the battlefield from your hand tapped and attacking.
When Palinchron enters the battlefield, it triggers, untapping up to seven lands.
Activate Prosperous Thief's ninjutsu ability by paying {1}{U} and returning Palinchron from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
If you control up to seven lands that can tap to produce at least {4}{U}{U}{B}, this combo nets infinite mana.

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