Totally agree with those choices

The only cards I’m somewhat unsure about are Smite and Warmage. Warmage, along with the medics to some extent, dilute the rez pool. The best scenario I can imagine for Smite is against secret pally secretkeeper on turn one on the draw, or murlocs. Besides that it looks pretty weak. Maybe Cabal Shadow Priests with the Forbidden Words? At least she is a 4/5. Convincing Infiltrator also looks quite good with rez effects here.
Like the deck overall!

Looks really good. I’m tempted by Tricaster. What do you think of that card?

Love the general approach here. Some interactions look really strong, and Catrina is plain broken. I don’t like the two-of Medic, and think you could go down to one or zero. Also don’t like Hakkar with no way to remove the bloods from your deck. Other decks will have ways to do it, and you’ll be left with them in your deck alone. Shadequill is fine but questionable without silence effects. Perhaps another Forbidden Words and a few Cabal Shadow Priests would be good, as that combo is insane. Maybe you want Mass Resurrection as well, given all the deathrattle triggers.
Anyways, great start and I want to build something like this now.

Definitely agree with your points. Morrigan and Fel Lord enable somewhat alternate value game plans, but they could just end up messing up the combo, as with the other cards you mentioned. Early game survival is now in the form of minions rather than spells for Warlock, so it gets a bit tough to pick other cards that don’t water down the combo as well. I imagined Fel Lord with any of the life gain minions, Hakkar, or undatakah. Morrigan was to pull life gain taunts, add to undatakah, or pull Hakkar.
Again, this might be a few decks mixed into one, but I really enjoy some of the weird interactions that come up with this deck. Thanks for the comment.