I have been considering the life lands more and more watching control decks struggle without the lifegain that Sphinx's Revelation provided. And, they are dual-colored lands to boot!
That seens like a solid judge of it, didn't really look at it too closely because I haven't really made a stable decklist yet, more so a list than fuctional deck.
I actually see him being even stronger, seeing as he does not turn on. He is harder to deal with since people ususally do not use much enchantment exile, aside from a rise in Erase, but thats only for white, along with Deicide, and Banishing Light.
It is a good card, but in comparison I feel as though Dig Through Time has more of a control-speed draw spell. Yes, main-phasing a draw spell isn't bad to do, but having the option to do it at the end of turn, let alone you choose the two you are to get, where as you have to set-up Treasure Cruise to make it decent at times, and is much less controlled. But, in respects to looking at Liliana, I think it could be just as good.
I can see that, and am less interested in it looking at it in that perspective. But, at the same time, many things are being compared to what was available to use in the recently-rotated set. Yes, it may not be as powerful as Jace was, but, it is an effect that is similar to his -2. But the only difference is that One is still standard.
It was just an idea that I have been including in the blue-build cotrol decks I have been looking into/building upon. Currently I am testing U/W, and from my knowledge of U/B, He seems to be better supported in 2 color and less decks. Those two were the primary creature focuses, but I was not sure from which to choose. Prognostic Sphinx gives a great scry, and has protection, where as Stormbreath Dragon is a hasty creature that is pro-white, and has a great monstrocity that goes even better with its starting 4/4 body, though gets stoked by Stoke the Flames.
Comparing the two, I think that Liliana Vess actually does a better job of what I was wanting, and does even more than I had hoped for with Jace. She attacks the had, which is very likely to help alongside cards such as Thoughtseize, and she tutors up cards that can be snatched up quickly. But, I also see it fueling their graveyard for any delve card they may be holding, but that may be miniscule in comparison to what they have in hand, and is one less card to have to deal with.
I cannot think of many things that fit into the color scheme that deal well with creatures. Now some that come to mind, but can be a bit awkward are Aetherspouts and Polymorphist's Jest, not to mention In Garruk's Wake is pricey, but aside from that I cannot think of any, unless I am skipping over some. Aether is very conditional, and Poly does not take care of them unless I had something such as Anger of the Gods or Drown in Sorrow to follow up.
Mogis I just recently stumbled upon from research, and I think he has a spot somewhere in the deck, though I would like Keranos, but I feel as though seeing them together may not happen, and it would make me a little leery to go with a consistant enough amount of both with a card such a Deicide floating around.
I was thinking of this card as well, but I must say I do not like it mainboard. It hits too little compared to something that is a mana more and hits anything. But when it does hit, it is one of the better counters to have.
I apologise for my replies, because most of them almost contradicted themselves (and some still may be contradictory) as I wrote them since I was stimulating my thoughts in a way I had not touched upon yet.
