Great Whale | Shrieking Drake | Panharmonicon

Cards

Panharmonicon on the battlefield.
Great Whale and
Shrieking Drake in hand.
You control up to seven lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
({3} magic symbol) available.

Activate up to seven lands by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Cast
Great Whale by paying ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) .
When
Great Whale enters the battlefield, it triggers twice.
Resolve the first trigger, untapping up to seven lands.
Holding priority, activate up to seven lands by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Resolve the second
Great Whale trigger, untapping up to seven lands.
Cast
Shrieking Drake by paying ({U} magic symbol) .
When
Shrieking Drake enters the battlefield, it triggers twice, returning it and
Great Whale from the battlefield to your hand.
Repeat.
If the seven lands can tap to produce at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) , this combo nets infinite mana.