Cheesgear, you overlooked some special abilities for Wraiths, including one that I think has the possibility of an unholy combination with a C'tan's Time's Arrow.

First ability: Particle Casters, giving them a S6 pistol
Second ability: Transdimensional Beamer. It's only got a range of 12" and it's a Heavy weapon, but the target has to make a Strength check or get removed from the table. No armor saves, no multiple wounds, no FNP.

Third ability (which is the combo): Whip Tail. Any model in base contact with the Wraith has Initiative 1.

So Wraith and the C'tan charge the enemy unit. He has Initiative 1. Before combat starts, he has to make the check or die.