I think mark should be death and to replace the phase salvagers you should have a 6 spark and viruses if you want more dying creatures. Plus they have a good chance of taking a enemy creature down with them. Not sure if 4 soul catchers is enough I think you should have at least 5. Also if you ever get tired of me trying to improve you decks just say so. I have no idea if this thought has ever crossed your mind but if it ever does I can back off.