Thousand-Faced Shadow | Great Whale | Prosperous Thief

Cards

Thousand-Faced Shadow in hand.
Great Whale and
Prosperous Thief on the battlefield.
Prosperous Thief and
Great Whale do not have summoning sickness.
An opponent cannot block
Prosperous Thief 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) ({U} magic symbol) .

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} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate
Thousand-Faced Shadow's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) 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} magic symbol) ({U} magic symbol) 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} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) , this combo nets infinite mana.