Flameshadow Conjuring | Temur Sabertooth | Great Whale

Cards

All permanents on the battlefield.
You control up to seven lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) ({R} magic symbol) ({G} magic symbol) .
({1} magic symbol) ({U} magic symbol) (at most) available.

Activate up to seven lands you control by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Cast
Great Whale by paying ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) .
When
Great Whale enters the battlefield, it and
Flameshadow Conjuring trigger.
Resolve the
Great Whale trigger, untapping up to seven lands you control.
Activate up to seven lands you control by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Resolve the
Flameshadow Conjuring trigger, causing you to pay ({R} magic symbol) to create a token copy of
Great Whale with haste.
When the token
Great Whale enters the battlefield, it triggers, untapping up to seven lands you control.
Activate
Temur Sabertooth by paying ({1} magic symbol) ({G} magic symbol) , returning the nontoken
Great Whale from the battlefield to your hand.
Repeat.
If you control up to seven lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) ({R} magic symbol) ({G} magic symbol) , this combo nets infinite mana.