Evie's ultimate slows and cripples enemies, soar towards the enemy's spawn and try to catch their tanks and healers in the Ice Storm, it can seriously delay them and give your team precious seconds to secure the objective!
Run a jump loadout with the card where Impasse knocks you up into the air. Use this to jump onto Kinessa, and then immediately cripple her with Treacherous Ground Warder's Field. She's very squishy and will have no means of escape.
Make sure either Grohk or his totem is dead before using your ultimate. Give about a second after the totem dies, so that the enemies' CC immunity wears off first. Otherwise, your Ultimate will do nothing when the enemies have CC immunity.
Use your ultimate to keep people away, the optimal time to use it is overtime on center.
in case of pushing the payload, you can put it in front of the cart.