Interestingly this deck seems to be making some Top 8 appearances (http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/td/116) after dropping White for more Black control options. They are also running Abyssal Persecutor alongside Grave Titan for some earlier beats, probably due to the prevelance of control in the current meta. Worth taking a look at anyway, if nothing else than to sort your mana out (no Creeping Tar Pit??!?!). Losing White in your deck does lose you Venser though, which would be a bit of a blow. By the by, U/R control is dead so my deck is no longer anything like a top 8 deck, so w00t!
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Seems nice, liking the proliferate possibilities. Got a few suggestions of other cards worth considering, mostly in an effort to further break proliferate whilst keeping the overall control feel: Enclave Cryptologist - very nice if you can get it to level 3 quickly, drawing you an extra card each turn. Gul Draz Assassin - for a repeating Grasping Darkness on legs. Halimar Wavewatch - a nice sideboard card against anyone running blue (ie. Keir and me) making a 6/6 islandwalk at highest level, whilst also providing a solid 0/6 body against more aggro builds. Inexorable tide - not sure if it's really good enough only coming down turn 5, but maybe worth a shot Lighthouse chronologist - I just love this card... Was wondering what purpose the Grasping Darkness in the sb served, as I can't think of that many black creatures other than Grave Titan (which it can't kill) that you need it for. Disfigure is better against Hexmages which might screw your Planeswalker win cons, and otherwise I'd have thought you'd be better running extra protection like Turn Aside to keep your walkers safe. Also, get yourself some Tetonic Edges, they're the shit!
It's good - have you thought about putting Jace Beleren in your sideboard though, as he's the perfect answer to anyone running Jace, The Mind Sculptor, i.e. anyone running blue... Also, do you think that Liliana's Spectre is a better 3 drop than Sea Gate Oracle? I'd go with the latter against most opponnents as you are usually looking to be the controlling player and a 1/3 that gives you library manipulation and draws you a card is better than a 2/1 flyer that causes an opponent to discard (fairly useless against aggro). Obviously you could side in the Spectre's against heavy control where they would really shine. Also Mystifying Maze is pretty good in a control deck like yours, so I'd stick in one of them.
You clearly missed the bit at the top of the page that says work in progress... Got rid of Karakas and the extra Ship's Navigator