Orvar, the All-Form | Clockspinning | Roaming Throne

Cards

Clockspinning in hand.
Orvar and
Roaming Throne on the battlefield (
Roaming Throne with any creature type chosen).
You control a nonlegendary permanent that enters the battlefield untapped and that can tap to produce at least ({U} magic symbol) .
({9} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) available.

Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting
Roaming Throne.
Orvar triggers twice, creating two token copies of
Roaming Throne.
Resolve
Clockspinning, returning it to your hand.
Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting
Roaming Throne.
Orvar triggers four times, creating four token copies of
Roaming Throne.
Resolve
Clockspinning, returning it to your hand.
Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting any nonlegendary permanent you control that enters the battlefield untapped and that can tap to produce at least ({U} magic symbol) .
Orvar triggers eight times, creating eight copies of the mana-producing permanent.
Resolve
Clockspinning, returning it to your hand.
Activate four of the copies of the mana-producing permanent by tapping them, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Repeat from step 7.