Major changes, first of all I made the deck an ISD block deck. This only lost me the sorin's thirst and fume spitters so its not a big loss and now its significantly more competative.
In block the only deck things that give this trouble are heavy lifegain and curse of death's hold.
As far as changes.
Main: -3 Fume Spitter, -3 Sorin's Thirst, -3 Diregraf Ghoul, -1 bump in the night
Main: +3 Killing Wave, +3 Gravecrawler, +1 bone splinters, +1 typhoid rats, +2 ghoulcaller's chant.
Spitters and thirst weren't block constructed. Diregraf isn't as good as gravecrawler(this deck is one I put together os limited to what i can afford), and removing a bump in the night for a bone splinters is helpful. Adding in killing wave makes this deck crazy, I have won multiple games by just killing wave for 2. One game I had 2 artists and just sacked my field (5 creatures. so 10 damage there) and my opponent had 5 creatures. Either way it was an instant kill for 3 mana. The card is insane and cheap.The rats are just another creature that likes to die and they are very low on mana cost.
Sideboard just some changes to fit block constructed.
Per conley woods awesome pro tour deck, a Killing Wave or two would be sweet, you can pay one black and sacrifice all your creatures and drain them for a million with Blood Artist , and every mana you pay into it makes it tougher for your opponents.
I was going to put in killing wave but didnt have the cash, and which conley woods deck? can you provide a link so i can check it out?
He talked about turns where he would have a messenger with no counters, a gravecrawler, a falkenrath noble and a blood artist, and on a turn 5 he went "artist, wave for 1, let all my guys die, drain you for 12, get another 2 damage from messenger dying, recast gravecrawler.