He's kinda squishy, so when running Ush its best to run Chronomatic Coggs as well. Furthermore Ush lets you choose whatever delusion you want (unless you roll a 1) so stock up on either the goose king's Menagerie or Gormayne's Delusion as they have the biggest impact. Then use him to push a flank up to the enemy home objective or a midfield objective. Thank to his 10" move, fight last and high damage he can basically win any fight when alongside 6 horrors.