Vorel of the Hull Clade does not have summoning sickness.
({4} magic symbol) ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) ({U} magic symbol) the first turn, and ({G} magic symbol) ({U} magic symbol) available each extra turn available.
Steps
Cast Teferi by paying ({4} magic symbol) ({W} magic symbol) ({U} magic symbol) , causing it to enter the battlefield as a 7/7 Dinosaur creature in addition to its other types due to Displaced Dinosaurs.
Activate Vorel of the Hull Clade by paying ({G} magic symbol) ({U} magic symbol) and tapping it, doubling the counters on Teferi.
Activate Teferi's third loyalty ability by removing ten loyalty counters from it, causing you to take an extra turn after this one.
At the beginning of your end step, Conjurer's Closet triggers, blinking Teferi, causing it to enter the battlefield as a 7/7 Dinosaur creature in addition to its other types due to Displaced Dinosaurs.