I haven’t made any concrete decision on Sun Titan yet, If I do add it, Akroma gets taken out.
I prefer ronom unicorn to this. I don’t want to have to wait to play my 2/2 bear
I’m not including bad-o-war. But since your cube keeps balooning in size I could see playing it.
In a 450 card cube Ingenuity isn’t worth playing. In a 600ish card cube, I would play it.
I’m taking out Ancestral Visions for Preordain
I don’t think Dark Tutelage is worth a spot. It is a bad Phyrexian Arena and bad dark confidant. I don’t like not being able to kill this (in a black based deck) if I get low on life.
Liliana’s Specter is good. I’m not sure what I’m cutting for it yet.
Grave titan is the best card in m11.
Ember hauler is taking the place of Slith Firewalker in my cube.
Fling is not worth a slot.
Inferno Titan is awesome.
I’m taking out Keldon Vandals for Maniac Vandals
Cultivate is going in over Search for Tommorow
I’m not adding in a second Survival quite yet. But in a 600 card cube I agree with the adition.
While the Slime is cool, I don’t think its good enough.
I’m not sure if I’m going to play Obstinate Baloth instead or in addition to Ravenous Baloth.
I like my fattiest better than Primeval Titan.
I have enough ramp where I don’t need to play Sylvan Ranger, but I would be playing it if I were you.
Brittle Effigy is kind of meh. If I ran this I would be running Trinket mage in addition though.
Crystal Ball and Sword of Vengance looks good.

Blue
Aether Adept: since U doesn’t have too many cheap creatures, this should be an auto include
Jace’s Ingenuity: looks like a good card draw spell for such a big cube
Preordain: If you like this card, you should find some room for Ponder as well.

Black
Dark Tutelage: With the high cmc in your cube, I don’t think you will be too happy with this card. People with an 0.5 mana lower average casting costs are skipping on this card, because it is just so much worse than Bob (which still doesn’t appear on your list) / Arena. I would recommend adding Dark Confidant and/or Graveborn Muse instead.
Liliana’s Specter: Shrieking Grotesque saw some T2 play and tuning him into a moncolored card should make him good enough for the cube.
Grave Titan: Best cube card of this set

Red
Ember Hauler: red aggro can use another 2 drop
Fling: You do realize that this is reprint, that nobody played before M11 (outside of maybe Affinity), where you even could stack dmg?
Inferno Titan: Nice a red Triskellion in XXL
Manic Vandal: Virdian Shaman is a great card, no matter in which color

Green
Cultivate: everybody should know by now how good Kodama’s Reach is
Fauna Shaman: So much worse than Survival, but most likely still good enough for the cube.
Obstinate Baloth: auto include
Mitotic Slime: Worse green playables ~ than most other green playables ~5 mana, but i f this can kick out one of your other expensive token producers (Centaur Glade / Bestial Menace) it is a huge upgrade.
Primeval Titan: Shouldn’t my finisher just win me the game? This look even worse than Vigor, which sees about 0 cube play.
Sylvan Ranger: it costs 1 more mana, but Krosan Tusker gives you an extra card instead of a 1/1 + has some potential with reanimation and lategame value if you just hardcast him.

Artifacts
Brittle Effigy: For 5 mana, every color but green (which can just play a bigger dude) has something better to get rid of creatures.
Crystal Ball: It gives you a great increase of card quality if the game lasts longer and is a powerful addition especially for slower builds.
Sword of Vengeance: Until we will get more playable equipments with Mirrodin 2, Akroma’s sword has its place in the cube

Although I don’t think Fling is going to be any good.