The main theme of the deck is B/W tokens. Humans turning into zombies, vampires and spirits.
It's build around morbid, generating tokens and some graveyard recursion.
The line you want to open with is:
Doomed Traveler + Skirsdag High Priest +
Bloodflow Connoisseur
=
a 5/5 flying demon token + a (tapped) 1/1 flying spirit token + a counter on your Connoisseur. Turn 3.
At the moment I use
Falkenrath Torturer
for this. I think it's just as good as the Bloodflow Connoisseur because there are many humans to sac and you get flying (and a 2/1 starting body).
To support the High Priest's ability there is Lingering Souls so sac and/or tap the tokens, also Blade Splicer. Altar's Reap is included as an alternative sac outlet. You could also force morbid with Liliana's -2 ability.
To get cards in your graveyard use Liliana of the Veil's +1 or Zombie Infestation.
Cards you want to discard:
Sun Titan/Grave Titan + Unburial Rites
Cards you don't mind discarding too much:
Lingering Souls
Any doubles you don't need (there are quite a few).
With Sun Titan out you can discard any permanent with cmc 3 or less to recurse later.
Control:
Tragic Slip, Go for the Throat/
Revoke Existence
and Oblivion Ring (recurse with Sun Titan).
The rest of the cards:
Gideon's Lawkeeper
nice control and a human creature to sac.
Sorin, Lord of Innistrad and Elspeth Tirel just awesome for tokens!
Solemn Simulacrum mana ramping/sorting and a good creature to sac. Gets a (small) boost from the splicer.
Undying Evil creature protection and crazy with ETB effects.
Wakedancer
token generating human that has great synergy, with morbid it can replace the traveler in the 5/5 demon token combo.
Avacyn's Collar
more tokens (to tap) when humans die and the vigilance is nice with a fat Falkenrath Torturer/Bloodflow Connoisseur.
Intangible Virtue and Vault of the Archangel don't really need an explanation.
The Maybeboard is full of cards that crossed my mind, but did not make it.
Under construction (at the moment not even 60 cards). Your help doing that and your comments are appreciated!
Think I need to streamline this deck a little more, but what to take out?