TotalBoss666

Any comments and advice would be most helpful, thank you.

nice, you should see my mana ramp deck :)
http://www.mtgvault.com/totalboss666/decks/greenblue-mana-ramp-deck/

Yes but you have many empty slots in your sideboard

I'd put stomping ground in the sideboard

Would golgari grave troll be good in this deck?

maybe jace memory adept instead of ashiok, his -0 mills ten at once, unless you want that to be a win condition.

my only question is why do you have stomping ground instead of another mountain?

maybe consuming aberration

I'd put in counterspell instead of mana leak

its not really a mill deck

do you really need 25 land in ANY deck?

yes, but you'd still kill them with burn instead of mill

hardened scales would be helpful, because on lorescale and chasm skulker, every time you draw, you get 2 +1/+1 counters

honestly, if i was making a mill deck, i'd stick with the blue/black dimir, because if you really want a infinite combo with mindcrank, you can do duskmantle guildmage and it. It seems counterproductive to deal damage and give them back life JUST to mill them out.

still, the blocking aspect of shred-freak would be nearly useless seeing how you wouldn't block with him anyway and focus on attacking, so a 1 drop 2/2 that can attack turn 2 would be better than a 2 drop 2/1 that can attack on turn 2

but you get shred-freak turn 2 when you can get mindcrank turn 2 and still attack for 2

vexing devil would be good, but i would put it in instead of Shred-Freak

agreed.
especially instead of lightning strike.

I'd put in dreadbore instead of murder, it is much better