This is a similar that I have been doing a little bit of testing with. Vraska Has been proving worthwhile in that you can use her as an emergency button against anything proving troublesome. I am not sure on the Diregraf Ghouls because this list tends to want to have more impact later. The same can be said about the Slitherheads. I find the Shaman is a fine mid-late game card, but I can't say the same on the other two. Abrupt Decay and Ultimate Price both feel awkward in that they hit what the other misses, but they often sit dead. Decay doesn't hit Thragtusk or Restoration Angel but Price doesn't hit Armada Wurm or Loxodon Smiter. Deathrite Shaman is quite powerful though for a one drop, and Lotleth Troll is a powerhouse, puts the good old Wild Mongrel to shame.
I would drop traumatize, mind funeral and ludevic's test subject. I would try to fit in Vine Trellis and Wall of Roots for more mana defenders, then Drift of Phantasms to both fetch your sands if you lack one, or add to your defender count.
Reshape seems like the most comparable for the Daybreak Ceremony. Gust Elemental as already said is too large for limited. The Archangel does seem interesting, but it looks overly complicated for something that grants three abilities if the creature has any of them. Also, Mark Rosewater has said that if a creature grants the abilities and should have it itself, then the card says it explicitly now under the NWO. See Bellowing Tangelwurm.
I messed around with it when trying Mono-Black midrange infect. The deck as a whole wasn't that good, but I learnt that this plus Black Sun Zenith is actually a thing.
I had a friend who said he would quit magic if he ever got a foil Foil, it was a running joke for years. So I found one, and then proceeded to use it to counter only his spells when playing EDH with him.
"Enter the battlefield from your hand", but yes that is how I would word it. The other option is to make it into an artifact and skipped half the trouble.
I use the vapors in my spellslinger Garza Vol, Plague Queen deck. I run maybe 6 creatures and as many ways to take turns as possible. With Howling Mine effects abound, I get even more out of a turn skipped.
6 Forest
6 Swamp
4 Overgrown Tomb
4 Woodland Cemetery
4 Grisly Salvage
4 Lotleth Troll
4 Dreg Mangler
4 Gravecrawler
4 Deathrite Shaman
3 Abrupt Decay
2 Vraska the Unseen
4 Diregraf Ghoul
3 Slitherhead
3 Ultimate Price
3 Tragic Slip
3 Sever the Bloodline
3 Thragtusk
3 Duress
1 Tragic Slip
1 Ultimate Price
This is a similar that I have been doing a little bit of testing with. Vraska Has been proving worthwhile in that you can use her as an emergency button against anything proving troublesome. I am not sure on the Diregraf Ghouls because this list tends to want to have more impact later. The same can be said about the Slitherheads. I find the Shaman is a fine mid-late game card, but I can't say the same on the other two. Abrupt Decay and Ultimate Price both feel awkward in that they hit what the other misses, but they often sit dead. Decay doesn't hit Thragtusk or Restoration Angel but Price doesn't hit Armada Wurm or Loxodon Smiter. Deathrite Shaman is quite powerful though for a one drop, and Lotleth Troll is a powerhouse, puts the good old Wild Mongrel to shame.