Great Whale and Azra Smokeshaper on the battlefield.
Azra Smokeshaper and Great Whale do not have summoning sickness.
An opponent cannot block Azra Smokeshaper or Great Whale.
You control up to seven lands that can tap to produce at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) .
Steps
Declare Great Whale and Azra Smokeshaper as attackers.
When they aren't blocked, activate up to seven lands you control by tapping them, adding at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) .
Activate Thousand-Faced Shadow's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) and returning Azra Smokeshaper 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 Azra Smokeshaper's ninjutsu ability by paying ({1} magic symbol) ({B} magic symbol) and returning Thousand-Faced Shadow from the battlefield to your hand, putting Azra Smokeshaper 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} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) , this combo nets infinite mana.