" so i've recently read X-men hellbound one and two and gambit has just turned dazzler and northstar into dark versions of themselves. Other abilities he apparntly has is absrbing other mutants into playing cards and such. Its been hinted that with his potential fully unlocked. he could be an omega level mutant according to sinister. but the thing is...like with all death candidates (archangel) they all have added bonuses to their powers, its been 40 years since warren was turned into archangel yet we still don't know all the mysteries of his powers and what apocalypse did to him. Now we are gonna have the same issues with Gambit and the mysteries with his new powers, what exactly did he do to northstar and dazzler????? "

Apocalypse used Celestial technology to enhance his horsemen, so they can be altered in just about any way imaginable. Since his transformation, Gambit has been conflicted dealing with his "Death" persona, so being in Limbo, a hell-like dimension, brought all his darkness to the surface. His Death powers have something to do with transforming states of matter into toxic substances (I think) but I think there's a mystical resonance in the nature of his influence and manipulation of Northstar and Dazzler. That may or may not have anything to do with his allegiance to Apocalypse and quite possibly relates to his affiliation to the Thieves Guild (wasn't there some magic involved with them) 
Previously, we've seen ol' Remy see the future in his playing cards and now, he's able to trap whole bodies in them? There may be a connection there....or maybe I'm stretching.