I run it in every game I play above 500 points. Phantasmancy is wasted on the path shadowseer however. The primaris only affects the caster and his unit, and he can't join or be joined by anyone else. Run him with telepathy and the mask of secrets to watch troop units fall by the handful!
The solitaire with infiltrate, stealth, and shrouded is one of the best area denial units in the game. Hide him, and make the enemy stay clear of an 18" area of the table for most of the game. I field mine with Cegorach's rose, letting him reroll the single hit and wound for the kiss of death attack makes it SO much more capable
The death jester is an all star in my book. I try to run at least 3 in every army above 500 points, even if I am unbound. The more leadership tests you force your opponent to make, the better the odds they fail them. The first time you tell someone they have to make 5 leadership tests with their fire warriors at a -2, their expression is priceless!