Tradewind Rider | Intruder Alarm | Great Whale

Cards

Great Whale in hand.
Tradewind Rider and
Intruder Alarm on the battlefield (
Tradewind Rider without summoning sickness).

You control up to seven lands that can tap to produce at least ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) .

Activate up to seven lands by tapping them, adding at least ({5} 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 and
Intruder Alarm trigger.
Resolve the
Great Whale trigger, untapping up to seven lands.
Resolve the
Intruder Alarm trigger, untapping all creatures.
Activate
Tradewind Rider by tapping it,
Great Whale and one other creature you control, returning
Great Whale from the battlefield to your hand.
Repeat.

If you control creature(s) that can tap to produce mana, you can use that mana to pay for the creature and instead gain mana from the creature's ETB ability.