Attrition-based strategy whose goal it is to prolong the game then win in the long haul. Wins typically come from around turn 10, give or take a few.
Losses usually come from not having enough disruption to keep up. If I manage to actually pull the stops out and stall the game, I end up winning a huge majority of the time.
Potential Changes
Essentially the question is, how can I more consistently slow/stop my opponent's strategy? Typically, if I can successfully do that, I end up winning.
Strongly considering removing 2 rack effects for 2 more Victim of Night or perhaps Bile Blight.
Definitely need Liliana of the Veil replacing Necrogen Mists.
I've actually been holding off on Ensnaring Bridge, not sure if it's completely necessary yet. If I decide on going down the bridge route, it'll be replacing kill spells.
Might remove Death Cloud but the extra pox effect has helped, and having an end-game bomb is pretty nice. If X is 2 or greater, it's usually back-breaking. This was originally a placeholder, but I've grown to like it a bit.
General Strategy
Stop whatever their win condition(s) through disruption, then win through Rack effects. Typically, if I can disarm their early threats, I'll be successful.
Problem cards
Lingering Souls
Leyline of Sanctity
Chalice of the Void
Planeswalkers in general
Anything Eldrazi