I love playing pauper, and I think it is a great idea to get into it. I am currently playing, Dinrova tron, and Mono black control with a white splash. I have played UR blitz, but I hated it. I would not play that deck unless you are super into
pure combo. Dinrova tron is a different take on pauper tron, and it has a super fun way of finishing the game which is,
mnemonic wall,
dinrova horror, and
ghostly flicker. My version of mono black control is splashing white for kor skysisher, and I have a huge pile of creatures like
phyrexian rager, and
chittering rats. I use
gray merchant of asphodel as a finisher. This is all pretty normal for the mono black control deck, apart from the
kor skyfisher which I use to bounce stuff like Gary and
chittering rats to get a bunch of value. I actually don't have oubliettes for this deck, and I have been doing super well with it. The deck is also super budget friendly without
oubliette. As for your ideas delver seems super fun. Like I said, I think the right player can enjoy playing blitz. UB control is super fun, I'm thinking of building it. just don't play
murder, it is super outclassed by other removal in the format. Use
gurmag angler as a finisher for this deck. I'm not sure how I feel about the
presence of gond midnight guard deck.
Chainer's edict is very good in a lot of these decks. A few good less expensive options are,
diabolic edict, and if you are in mono black
geth's verdict.
I hope that this helps. I'm not really sure if I have been super helpful. Good getting into this awesome format.