Orvar, the All-Form | Great Whale | Whim of Volrath

Cards

You control up to seven lands that can tap to produce at least ({3} magic symbol) ({U} magic symbol) .

Activate up to seven lands you control by tapping them, adding at least ({3} magic symbol) ({U} magic symbol) .
Cast
Whim of Volrath with buyback by paying ({2} magic symbol) ({U} magic symbol) , targeting
Great Whale.
Orvar's first ability triggers, creating a token copy of
Great Whale.
The
Great Whale token enters the battlefield, untapping up to seven lands.
Resolve
Whim of Volrath, returning it to your hand.
Repeat.
Once you have infinite mana, you can target any permanents you control in step 2 to create infinite token copies of them.