Are you milling or proliferating your creatures? I would suggest picking the mill/proliferate route and skip the Hydras and Scute Mob .

Hedron Crab is great for what it does, especially with the fetch lands ala Misty Rainforest . Your other Allies and Undead Alchemist should come out, unless you want to focus on Zombie mill.

Fog and other such effects generally work well with Mill decks.

Card draw is another form of Mill. Like Rites of Flourishing and Howling Mine .

Thanks for the idea with the Hedron Crab and the fetch lands, it also worked very well with the Rites of Flourishing . I kept the Scute Mob and Hydras as they add a buffer layer against the fast attack decks and still benefit from the proliferate for the Grindclock

If you have a friend with an eldrazi ramp deck I would suggest running some Mindshrieker s