ULT spam build that can do upwards of 13k spirit damage on a target using the full combo (SSB buff/SSH buff, burrow, scorn, AF, ULT, and spam scorn while ULTing) while they have full EE stacks. From no EE stacks, you can get around 8k. It also seems from testing that SSH amp stacks act the same as EE stacks so getting both items can lead to over 10k full combo on a fresh target.
Your mobility comes from using FF with burrow to get around quickly while also using MC to fly around and rotate easily. You can also use MC to fly into a fight and target a specific hero or jump random enemies.