This is a very mean deck. It can kill every single opponent by turn 4 with the right cards, with the wrong cards it should be able to do it in a couple more turns. The deck was designed to win before running out of cards to play by going off with a Blowfly Infestation combo. While weak against control, Death's Creep is killer against anything aggro. It tears its way through enemy creatures using Blowfly Infestations and some help from Black Sun's Zenith. These two powerhouses will always ensure that you come out on top (as long as you don't burn your own creatures too much).
The Scarscale Ritual's really work well with Channeler Initiate.
The side board is if you need more control for combo decks or token decks. For combo decks the Contagion Engine's can come out of deck as they would be too expensive. Necroskitter can also be taken out because you will have no need for their combo pieces without the spells, and for token decks their tokens won't be coming back to the battlefield.
Turn 4 Win:
Turn 1: play a swamp and a Fume Spitter
Turn 2: play a forest and a Channeler Initiate
Turn 3: play a swamp or forest, an Obelisk Spider, and another Fume Spitter or a Glistener Elf
Turn 4: Play a swamp or a forest, a Hapatra, Vizier of Poisons, and a Blowfly Infestation. Sacrifice the first Fume Spitter to kill the second one with the -1/-1 counter. put the -1/-1 counter that you get from Blowfly Infestation on the 1/1 snake you get from Hapatra. The snake will die but you will get another one to replace it. Keep killing the snakes for nineteen more times triggering Obelisk Spider each time a snake dies.
This combination will inevitably occur in some form during the game. It can give you infinite snakes or insects, and can directly drain each opponent. I prefer including Obelisk Spider in the combo because the 1/1's this deck generates are very susceptible to board wipes, and without the spider you will have to wait a turn to kill everyone after going infinite.
