Orvar, the All-Form | Great Whale | Elvish Fury

Cards

Elvish Fury in hand.
Orvar and
Great Whale on the battlefield.
You control up to seven lands that can tap to produce at least ({4} magic symbol) ({G} magic symbol) .

Activate up to seven lands you control by tapping them, adding at least ({4} magic symbol) ({G} magic symbol) .
Cast
Elvish Fury with buyback by paying ({4} magic symbol) ({G} magic symbol) , targeting
Great Whale.
Orvar's first ability triggers, creating a token copy of
Great Whale.
When the
Great Whale token enters the battlefield, it triggers, untapping up to seven lands.
Resolve
Elvish Fury, giving the nontoken
Great Whale +2/+2 until end of turn and returning
Elvish Fury to your hand.
Repeat.
If you control up to seven lands that can tap to produce at least ({5} magic symbol) ({G} magic symbol) , this combo nets infinite mana, which you can then target any creatures you control in step 2 to create infinite token copies of them.