What I possible see from these cards are some nice new mechanics that can be added into the game. But on the other side, holy was nerfed to death and probably needs a little rebuff, since i dont see many holy decks floating around (By the way, i miss the old upgrading mechanic of death before dishonor, it was something very unique in the game. It does not need to be added for the zealots again, but it would be nice to see on a set of cards soon). But there are keywords that needs a buff more desperately, like runic, alliance (runic has become stronger than alliance, what is somehow odd) and demonic. and don't forget about restoration, which was nerfed into oblivion.
So ranking from these perspective, heres what i would like to see in the game:
-Night demon (a efficient, interesting card with the demon keyword)
-Hydromancer (See below)
-Whirlpool (Hand manipulation is very healthy for the slower decks in this game.)
-Hellmare (synergy cards are the only way to make a pure demonic deck reasonable)
-Treetop village (Alliance is struggling because many of them are offensive, while they need to increase their facilities and use production cards. Its a remain of the runic/alliance split, since all elf cards back then where offensive, while the dwarfes were the defensive part of the deck. This removed the most defensive cards of this keyword, removing the higly needed defense to make facility increasement worthy. So this is a card alliance higly needs.)
-Shadow demon(I like the idea of punishing opponents slow decks)
-Tartarus ravine (Ok, thats my favorite, i have written at some topics why titan decks want this card...)
-Icarus (I love that concept and flavor. Period.)
-Guildmaster (Another wincondition for alliance doesn't sound bad at all. This card would at least make the allaince deck vaible again. A cap is shouldn't be too low, since you already got rare alliance cards which adds 10x unconditional production.
A little copyright thing: The image is from mtg:
http://magiccards.info/m13/en/168.html)
-New growth (I love little cards with good effects, so this one is one of them for sure)