Just want to make it clear that RTR isn't going anywhere. Ravnica Block will be here for the next 14 months. It's innistrad block and m13 that are rotating out at the end of September.
You also can't base your strategy for playing with cards on DOTP. It's leagues different in a real competitive environment. Cards that are in the game are _not_ cards irl.
Doom blade is fine removal, but for decks like this you want to diversify your removal package. So, you should run 1 maybe 2 doomblades, you're trying to mill them out which is barely a valid strategy right now. It may come into play more post rotation, we'll have to see. I hesitate to give advice about rotation because we don't know what theros will bring.
Land - your land seems fine if you really don't want to pick up anything that's not rotation.
2 Dimir Guildgate
9 Island
9 Swamp
4 Watery Grave
SPells - Mill decks need to control the game first, mill your opponent 2nd. I also wouldn't go all in on the mill, but leave it as one possible outlet for winning.
2 Tome Scour - cut this, for some sort of draw engine. Control decks win off the back of card advantage. Milling your opponent doesn't give you card advantage. .
4 Breaking // Entering - again, doesn't control the game, doesnt provide card advanatage.
2 Doom Blade - good spot removal
3 Mind Grind - you can run this as a 1 of/2 of finisher, 3 is too much here. You need cards that lock down the board more.
2 Far // Away - good removal and effect, needs to a 4 of.
3 Pilfered Plans - this does a little of both, it draws and mills, you really want to see your draw cards as instants though, right now that limits you to nothing good.
4 Psychic Strike - seems fine. but you want to diversify your counters a little more. syncopate exiles, this is important effect.
2 Traumatize - this will not win you the game. It only shortens the amount of mill you need, but does nothing else for you. If you play this against some decks they will just laugh in your face
Creatures
3 Wall of Frost - i would like to see some vampire nighthawks, but if you really don't want to include anything I guess this guys okay. You might look into the new lifebane zombie and the new blue guy that taps down creatures.
3 Crypt Ghast - I see where your going with cryptghast, but I think you'd be better served by a couple more desecration demons.
2 Desecration Demon- your best creature for value. needs to be a 4 of.
2 Consuming Aberration - he's okay. Not good, not terrible...
walkers
2 Liliana of the Dark Realms - okay walker, no lili of the veil though
2 Jace, Memory Adept - work horse, jace is what you want to play to close the game.
Additions.
Jace architect of thought, huge draw engine advantage, and aggro dampener. a must include in this deck.
aetherling. Diversify your win conditions. If they out control you or you stumble then you need a backup. (replace aberration with this).
dimir charm, is a solid card... need to include these.
syncopate
escence scatter, is cheap.
claustraphobia
keep in mind you have no lifegain right now so you need to be able to remove all their threats pretty quick. There isn't a real "sweaper" for you if you don't include mutilate.