MTG Salvation

I'd keep both, although the first is very much borderline. Second has 2 lands, 4 castable spells that (given you draw a land other than a temple in your first three cards) curve into each other perfectly and will completely take apart your opponent's hand, as well as double black and a white source. Obviously both are dependent on the matchup, but I'm fairly certain that your odds of getting a better hand for the second hand on a mulligan is pretty small.

Day of Judgement should be the strictly better Damnation or Wrath of God.

Rakdos Charm is still good even if they side the combo out. Stops big snapcaster plays, blows up batterskull, and provides extra insurance against them comboing out.

It's certainly not immune but it is fairly resilient. Shadow and counterflux will delay it, and for the most part that's typically how you beat scapeshift (you are the aggro, kill them before their bomb kills you). Slaughter games is a problem for a lot of current scapeshift decks but is largely unplayed. If scapeshift players are really worried they can run prime time/inferno titan/wurmcoil/insert finisher here and just win with baloth and fatty beats.

If people want casual fun they should play kitchen table or edh where telling the other guy that you don't want to play against his deck is viable. As for prison dumping on creature based strategies, the various prison matchups all have differing matchups. 8rack stomps draw go and other bridge decks. LD strategies have issues with fast combo and low mana decks. Sure there are some prison decks that crush creature based strategies, but if you can't punish creature based strategies the metagame is just gonna stagnate into play bigger dudes and beat their slightly dudes to death.

You should run snapcaster. Sure it turns on removal, but honestly you're just running it as extra of whatever you have in your graveyard. Bonus points for occasionally beating people/planeswalkers to death and chumping random threats.

Without top and/or brainstorm there's really no reason to play miracles instead of UWR control. I'm sure if we even had brainstorm that cost 1U some of the miracles might see play but as of now there's just no reason when there's neither a way of guaranteeing that you draw miracles when you need them nor a way of getting them out of your hand for actually castable cards.

Looting + Peer costs exactly the same mana as Scour + Ravings and Ravings isn't nearly as unpredictable as it seems. Look at it this way, drawing two cards and discarding one at random is either equivalent to milling yourself for one and drawing a card (and with flashback that is actually a good card that is better than think twice in a deck that uses its graveyard) or it's equivalent to drawing two cards and then discarding a card that you haven't played from your hand. The only cards that we wont cast before ravings are extra copies of engines/lands (which are ideal for discarding) and rituals (sucks, but drawing two cards and pitching a ritual isn't awful) or extra cantrips that we can't play through a rule of law effect. None of those are actually problematic to discard, and while the random can on rare occasions bite us in the ass, overwhelmingly we pitch something non-relevant. In any case though this whole discussion is pretty pointless because storm is a deck of percentage points and nobody is providing information on what the actual change in combo rates are. If you really think that your non-standard choice is superior play 10-20 matches with both sets against tier decks and give us your results.

Void Snare being a sorcery really sucks and probably makes it unlikely to be played over echoing truth or vapor snag outside of potential gifts piles since for combo decks you ideally want to both be able to defend your bounce spell and your combo and for tempo decks it's important to be able to keep your options as open as possible/play combat tricks.

Also, Necromancer's Stockpile could potentially be really good. People already pointed out making free 2/2's at instant speed with Shambling Shell, but you can also just plain old mill yourself very quickly with Stinkweed Imp (Pay 1B, discard imp, when you draw for the ability choose to dredge imp; you've basically paid 1B, milled yourself for 5 cards, and spent no mana to do so). I don't have much experience with dredgevine, but being able to potentially accelerate you into free vengvines on top of grinding out free zombies with shell and Gravecrawler might make it playable.

Peer vs Scour and Ravings vs Looting is something that should really be decided through actual playtesting. I'm fairly certain that Ravings is superior to Looting because it actually draws cards, but I'd say that Peer vs Scour is much closer; scour can potentially find an engine and gives more raw gas for pif, but peer will rarely if ever whiff. On gut feeling I'd say the lower mana cost of scour gives it the edge, but it's a tough call. I'd test it out, but I have no experience in this sort of stuff and am not confident in the ability to provide good data. If anyone else wants to play the matches I'd be happy to analyze the results though.

Also, if you're running a transformational sideboard plan what matchups do you expect these sideboards to improve? Also, I'd probably cut some of the cards out of the last twin transformation plan (1-2 kiki, 2-3 pestermite) for protection like remand or dispel.

Edit: Also, it looks like the current primer doesn't mention anything about Eidolon of Rhetoric from pod. I think echoing truth is an important card for the matchup so you're not completely dead to eidolon, but how about running a singleton flame slash for extra security? This is my current sideboard:

Miracle'd Reforge the Soul is cast during your draw step, assuming you draw your first card of the turn during your draw step. Also, 5 mana is a lot for a wheel effect and unless you're expecting to be facing a lot of lili drawing cards really shouldn't be an issue and will probably result in you getting the worse hand.

Also, from the previous thread Blood Moon, Defense Grid, and potentially Echoing Truth are all good to sideboard in against UWR. They don't really pressure us, so just cantrip and force them to answer you and eventually you'll achieve critical mass and kill them.

Thought Scour increases your chances of hitting an engine in exactly the same way as any cantrip increases your chances of hitting an engine. While the milling out technically does decrease the odds of you not drawing an engine, it only does so in the sense that if you were to draw your entire deck you could theoretically mill away all of your engines. On the scale of drawing 30-40 cards out of your 60 the mill does not affect your chances of drawing an engine, while it does provide a significant increase in the odds of you being able to successfully online an ascension or kill with pif.

Also, a mod needs to delete/lock one of the storm threads, it's confusing.

Blood Moon, Defense Grid, and Echoing Truth are all (potentially) solid. If it's not maindeck maybe bring in a singleton empty the warrens so you can ritual into 6-8 goblins and just beat them to death (if you think they might be running Anger of the Gods or Supreme Verdict post-sideboard you might want to cut empty). They have pretty low pressure so you can probably just wait until you have a fistful of spells, juice in your yard, and decent mana and force your way past their hate.

I'd really consider adding Sterling Grove. Combined with Privileged Position it makes all of your permanents untargetable (unfortunately it gives your other enchantments shroud instead of hexproof, but you can always sac it for 1 mana if you really need to be able to target your own enchantments). It can also potentially find silver bullets and can be used with Sun Titan and Silent Sentinel to draw nothing but action. I'd also recommend Idyllic Tutor and Plea for Guidance.

I don't think that there's a single combo that always wins on the spot, but City of Solitude + Laboratory Maniac + draw beats pretty much everything. There's also boring stuff like mike & trike for gb and various aluren combos. For other combos, infinite bears is pretty hilarious: Muraganda Petroglyphs + Kavu Lair + Words of Wilding + Ashnod's Altar + Concordant Crossroads. If you want to do something that's also quite funny (the first time) and wins on the spot you could also try any of the various Opalescence + Doubling Season high damage non-infinite combos.