I made it to 100 with this deck. It's very fast and versatile. I had early success with cull obsidian as well, instead of white widow. I swapped them out periodically however white widow was what got me from 90 to 100.
Cull pairs well with all of the 1 cost cards in case you can't destroy them all by the end of the game. Also you can venom a cull which is nice. White widow can jam up a spot pretty well almost gauranteeing you win that spot if you play your other cards right. For instance if you make the white widow spot your sacrifice pile and eat it with carnage or deathlock you've got a nice lead in that spot now due to widow's -4.
This was a really fun deck to play, destroying your own creatures to win the game can be very satisfying.