Thousand-Faced Shadow | Cloudstone Curio | Great Whale

Cards

You control at least one other creature that can attack this turn.
You control up to seven lands that can tap to produce at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Great Whale does not have summoning sickness.
An opponent is unable to block and kill creatures you control.

Declare
Great Whale and any other creature as attackers.
When they are unblocked, activate up to seven lands you control by tapping them, adding at least ({3} 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 the other attacking creature to your hand, putting
Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
Thousand-Faced Shadow enters the battlefield, triggering itself and
Cloudstone Curio.
Resolve the
Cloudstone Curio trigger, choosing not to return anything from the battlefield to your hand.
Resolve the
Thousand-Faced Shadow trigger, creating a token copy of
Great Whale.
The token
Great Whale enters the battlefield, triggering itself and
Cloudstone Curio.
Resolve the
Great Whale trigger, untapping up to seven lands you control.
Resolve the
Cloudstone Curio trigger, returning
Thousand-Faced Shadow from the battlefield to your hand.
Repeat from step 2.