For me personally, it has to be Omen's ult since you can literally teleport anywhere on the map and change how the game is going. You can scout a site that your team wants to push and see if the opposing team is guarding that site or not. Y...

I fool around in the practice range with the sheriff on elim 100 setting, just jumping around doing 360s and just bhopping and turning and hitting headshots with the sherif and the vandal. I see often that to jmprove with the sheriff you ne...