Satoru Umezawa | Yuriko, the Tiger's Shadow | Great Whale

Cards

Great Whale in hand.
Satoru Umezawa and
Yuriko on the battlefield.
Yuriko 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} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .

Declare
Yuriko as an attacker.
When it isn't blocked, activate up to seven lands you control by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Activate
Great Whale's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({B} magic symbol) and returning
Yuriko 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
Yuriko's ninjutsu ability by paying ({U} magic symbol) ({B} magic symbol) and returning
Great Whale from the battlefield to your hand, putting
Yuriko 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 ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) , this combo nets infinite mana.