Why'd you choose Tombstalker over Tasigur? He's cheaper, and doesn't have the double black that strains your mana base. He also has pseudo card draw. I'd also recommend Thought Scour if you can afford to fit it somewhere. Target yourself and it fills up your graveyard for Delve. Also, why so few Young Pyromancer?

JakeMG I was testing out Tombstalker to see if I could make any big delve creatures work, but it doesn't seem to work too well in the deck :/

I've tested Tasigur, the Golden Fang as well, but that didn't seem to work.

Initially, I had 3 Young Pyromancers and that seemed to work better - I'll go back to that set-up.

With only two delve cards (both of which I can usually afford to play) I doubt I need Thought Scour - Serum Visions and Gitaxian Probe are better cantrips in this deck. After all, I don't really want to be pumping the opponent's Tarmogoyfs.

5 check lands? 2 tar pits? That seems like a lot of come into play tapped lands for a tempo deck. Only 7 black sources? I think the manabase needs serious work before you worry about tasigurs or Tombstalkers. Also, what's the point of playing black without adding any hand disruption (Blightning doesn't count, it's awful).

I'd love to include more lands which enter untapped, but those are the most expensive - I find checks will almost always enter untapped. If I can acquire any better lands (fetches, more shocks, etc) I will certainly include them.

As for hand disruption, I want to include it, but can't seem to find any room for it. Currently, I use black primarily for unconditional removal (Terminate and stuff) but would like to add more cards like Thoughtsieze (although that shares a similar problem with fetches - VERY costly)

I understand that budget is a consideration, but Inquisition of Kozilek costs less than both Creeping Tar Pit and the shock lands you are already playing and is arguably better than Thoughtseize due to the prevelance of burn.

As for finding room, you can definitely cut Blightning and possibly 1 copy of Vapor Snag and/or Electrolyze.

I'd also suggest finding room for Thought Scour, you don't have enough cantrips to make Monastery Swiftspear a real threat and the extra cards for Murderous Cut are certainly welcome.

Thank you for your advice - I'll put in two Inquisition of Kozileks for now, and if I come across any Thoughtseize I'll probably replace those: I can always sideboard it out for Dragon's Claw against burn.

I've also put in two copies of Thought Scour, as I was looking for more cantrips to include. I'll playtest a bit and see if anything needs changing.

Seems pretty standard. Only thing I can suggest is more fetches, to power out Mr Banana a bit earlier, and shattering spree or shatterstorm over Vandalblast

Thanks for the advice - I'm collecting fetches at the moment, and if I can get my hands on any they're going straight in the deck!