As promised I'll finish my analysis on the remaining cards:
Gold (has some ok niche cards that will see some play that aren't tremendously good and some pretty nice ones)
Campaign of Vengeance (probably only for orzov life gain decks, but I can see this simply outright winning games as a finisher)
Gisa and Geralf (will be used in zombie decks, pretty useless outside of them)
Grim Flayer (would be great as an Uncommon, as a mythic its just 1 card in a delirium deck. Still it is a decent card by itself, better if you get delirium)
Heron’s Grace Champion (as if Humans needed more Combat tricks... This and the other flash human will make appearances, just because the human deck has so many options... Its a strong card that can swing games around with life gain)
Ride down ( not just in boros, but any deck r/w with creatures can use this. Kill a big blocker and do some damage, looks good to me for 2cmc)
Spell Queller ( another playable spirit, even outside of spirit Tribal. I'm sure someone will find a way to abuse it)
Tamiyo, Field Researcher (don't have to say much about Tamiyo, any deck that can play her probably will... Another power ranger)
Colorless ( I'm a little skeptical about emerge cards, I'll have to play some and see if the mechanic works. Artifacts are a little unimpressive, especially the meh equipments)
Decimator of the Provinces (probably the most interesting emerge card and its been confirmed. Reanimator can use it, ramp will too. Great finisher, only lacks hexproof to replace Crusher)
Distended Mindbender (discard is interesting, but I'm not sure if its playable)
Elder Deep-Fiend (flash can give this card versatility. The tap ability is ok, but not gamebreaking. I can see it being played in a low win-con deck as an end of turn muscle play)
Eternal Scourge (this guy looks playable in lots of decks. Even if he goes to graveyard, using exile creature from gy effects, make him playable again. Will be annoying. 3cmc for 3/3 is very playable)
Mockery of Nature (as if reclamation sage wasn't annoying enough... The good thing is, any color can have Enchantment/Artifact hate now for...9cmc)
Vexing Scuttler ( I can just imagine, playing the skaab, getting a card, casting this for 2cmc with emerge, get another card...)
Soul Separator (fun card. I can see people taking a go at cracking this card. Probably only for niche)
Terrarion (mana-fixing, cantripesque, delirium Helper. May see some play in 4/5 color decks and delirium decks. Has to be tested)
Double faced (some really good cards, some not so good, some I'd decide on, only after testing)
Lone Rider (this is a very strong card. Its good unflipped, gaining 3 life is easy enough. Flipped, its just monstrous)
Curious Homunculus (another great flip card. Ramps, easy to flip, makes spells cheaper, prowess and a good body... Awesome)
Docent of Perfection (5cmc, big flyer that can make Wizard Tokens. Flipping him isn't so hard, especially considering that there quite a few playable wizards - Stormchaser, Reflector Mage anyone?)
Voldaren Pariah (expensive, except with madness. Flip is costly but the payoff is big)
Kessig Prowler ( great one drop, flip is expensive but makes it more relevant later on)
Cryptolith Fragment (this in the right deck could work. It ramps, fixes and kills your opponent. All you need is some life gain and your opponent is on a clock. Flipped, looses some power but still nasty)
Land (only a couple of them... Nothing too outstanding)
Geier Reach Sanitarium (Looming land, looks useful, if the deck can live with colorless mana. Good for Reanimator and delirium decks. Will probably see some play in control decks too)
Nephalia Academy (sideboard card? I can see it in some self discard/top of deck effect combo, like matter reshaper... Niche card)
Meld (only 3/6? Cards. Angels are good, the land and Red card too, the Black ones... Meh, seems like Black is always getting screwed)
Gisela, the Broken Blade (awesome, even on its own. White did not need this... Will win plenty of games on its own)
Bruna, the Fading Light (too expensive. Will be played for the meld effect)
Brisela, voice of nightmares (ouch. Huge, flying thing that doesn't let you cast most removal. Meld her and win games...)
Hanweir Battlement (good, if thalia isn't on the board. Just How good requires testing)
Hanweir Garrison (looks pretty good too, combo with
valor in Akros and
Thalia's lieutenant. Auto include in boros Humans.)
Hanweir, the writhing township (good, but fragile... I would try to be careful when melding it, to avoid being 2 for 1ed.
)
And thats a wrap. Disagreeing with me is fine, but I always give reasons for feeling a certain way about a card, so please do the same. Its much more constructive and I have been proven wrong.
Lets see on wednesday what we get and what we don't.