I made a Magic The Gathering Theme Deck · 7:32am Jan 15th, 2014
Check it:
4x Uncle Istvan
4x Homicidal seclusion
4x Cathedral of War
4x Murder
4x Sadistic Glee
4x Corpse Hauler (Kinda looks like istvan)
4x Nemesis Mask
4x Fleshwrither
2x Devour Flesh
2x Death pit of rath
2x Altar's reap
2x Darksteel axe
2x Dark Ritual
18x Swamps
I like how you upgrade Istvan in a way that everybody must block him, plus he can't take damage and you make it so any creatures dies from his strikes. That's a good deck if you have a good hand in the beginning.
A classic (annoying) black deck, but in the sideboard, you should add stuff to prevent effect damage and/or milling because it seems that your deck is perfect for creature damage.
Edit : Maybe throw in one or two elixirs of immortality in the side. For the effect damage... I don't know if there is black counter spells :l