When Peregrine Drake enters the battlefield, it and Inalla trigger.
Resolve the Peregrine Drake trigger, untapping up to five lands.
Activate up to five lands by tapping them, adding at least ({4} magic symbol) ({U} magic symbol) .
Resolve the Inalla trigger, causing you to pay ({1} magic symbol) to create a token copy of Peregrine Drake.
When the Peregrine Drake token enters the battlefield, it triggers, untapping up to five lands.
Activate Barrin by paying ({2} magic symbol) and sacrificing the Peregrine Drake token, returning the nontoken Peregrine Drake from the battlefield to your hand.