Alright, so, my personal opinions on RTR so far.
Constructed:
EDIT: Completely misread overload. This card is extremely solid, and -WILL- see play. Flame slash in this format would be too good with Snapcaster to recur it, and while this card is significantly worse than flame slash most of the time, both of its modes are reasonably priced for what they do. This is your new Standard board wipe spell, control players. Enjoy it.
Nifty. Didn't need to be rare. If the gorgon or Jace end up popular, this could easily be maindeckable as neither of them generate card advantage (or even do anything relevant) while building loyalty. I can see this staying at 5-6 dollars and being very playable, but if the planeswalkers don't see much play, it's going to be a sorcery speed terminate.... Which actually isn't bad in this removal-light meta.
Raises an interesting question; is a planeswalker with a +1 that gives you literally no benefit or board advantage playable?
What if it protects her insanely well, to the point that an opponent will likely have to sacrifice 3 creatures to get rid of her?
What if she can go to six loyalty the turn she comes out?
.... What if her -3 is Vindicate?
Completely absurd card that will test player skill in Standard with her +1, and (hopefully) be able to control the board with her -3.
My only fear with her is the format may be too fast for her to give you significant advantage. If your opponent is racing you from turn 1 through 4, then guess what?
She's going to be completely ignored, and your opponent will just keep attacking you.
I really hope this card is good enough to make control/superfriends/midrange playable in Standard again. She has all the pieces, it's just up to the deckbuilders.
I will say one thing; turn 3 jace -> turn 4 Vraska is an absolutely insane play. If BUG superfriends becomes a deck, I will most certainly be playing it.
DISGUSTING. Ditching gravecrawlers to this should be a fucking war crime, and this card will end up popular even if G/B is terrible and we don't get a single playable scavenge card.
I cast plenty of Wild Mongrel back in Odyssey block. This card will cause problems.
I can't really say I think this card will be played in Standard, but I do love the design; the last few planeswalkers played competitively in standard had -loyalty abilities that protected them, and +loyalty abilities that provided card advantage. New Jace reverses this, and I suppose time will tell if that's an improvement or not.
His +1 is respectable, but in limited testing, is extremely underwhelming. Against an RB zombies deck, Jace will still die immediately after using his +1 nearly every time, essentially making him an overcosted Fog. His -2 is significantly better than Beleren's, but still isn't the "fact or fiction" people are claiming it to be; FoF was good because it was a 4cmc instant that dug 5 cards deep, promised you at least three of them, and dumped the rest in the graveyard. Jace's -2 is Ponder ~25% of the time (when you want the one card), and Divination the other 75 (when you want the two).
In a control oriented format or one dominated by token producers, this card would be amazing. But the upcoming format isn't looking like it'll be anything like that.
There's no reliable boardwipe in Standard, no good control spells, and removal is horribly outclassed by the insanely creatures in INN and M13.
Don't get me wrong, I love skilltesting in standard, and I want him to be playable... but he almost certainly isn't. All it'll take is one good board wipe to make him nuts, though....
I feel obligated to point out that this is an entire relentless rats deck in one card. It has no immediate board presence and it'll die if you look at it the wrong way, but the potential is pretty nutty. I don't think I've ever seen instant-speed creature generation on such a cheap card before, and if I had to choose a sleeper rare, this would be it. I still think the format's too fast for the card to see significant competitive play, but it's extremely efficient at what it does.
If you preordered this for $15 there is something wrong with you. While it's a very exciting card in some respects (a discard spell with the utility of also being a kill spell lategame), if this is an aggro format as everyone is speculating, this card will be a $2 mythic. I really don't think blightning would see play in the current format, and this card is nowhere near as good as blightning.