Why run 4 of's of legendaries? Especially one with Regeneration, its a dead draw that could be made a 3 of so that you can run 4 of a more utility spell like Armed / Dangerous or one of your 2 drop hasters also why Putrefy sideboard and spear main. Sorry for being so long winded but Id make Deathrite Shaman main in place of Experiment One since experiment only scavenges for 1 and deathrite is that good.

I have to play a complete playset of Varolz, the Scar-Striped because he is very important for the deck. If I have more than one I can simply discard one with Lotleth Troll . Searing Spear is main because it's cheaper and I have the option to deal 3 damage right in my opponents face.

Also I really don't get your argument with Deathrite Shaman ... Why should I play him main? He also scavenges for 1 so it's the same as Experiment One ... The experiment is way more agressive because he easily becomes a 3/3 or a 4/4.