You'd be paying 100+ for the Assassin, 100ish for the Chimeras, and 120 + Psykers for two units of Battle Psykers. That'd make it heading towards 400 points. I reckon for 400 points I could get more AP2 shots at a better range, but it's up to you. It was formulated for the Last Chancers in the old codex (make all 20 into Psykers), but it would have been mad points. Like 21 points a shot, plus Colonel S and Kage. And the Assassin. So like, 600.