Azir in the Crystal Scar
During the first phase of Dominion, no one should be able to leave the base due to the barrier surrounding it.
Azir can bypass this barrier by using Arise! in combination with Conquering Sands and Shifting Sands.
With an ample amount of cooldown reduction and some mana potions, Azir can even make it to one of the first turrets and promptly secure a capture before the battle begins. I suppose the Emperor has to have some benefits.
If a move command is given to Azir under these circumstances, he will automatically walk back to base. Flash will have no effect; Azir will simply remain in place.