Rave hit the nail on the head with
Braids, Cabal Minion. You don't need a dedicated deck, but you are rewarded if you have outlets that you can feed her. And if you aren't powering her out on T1, she is not oppressive. Really, if on turn 4 you can't deal with a 2/2 creature, you sort of deserve to have all your stuff sac'd.
She is particularly great though in a Stax type of deck. Bitterblossom tokens to feed her. I really love
Geralf's Messenger, but the mana cost is very prohibitive so I understand if guys do not want to run that. It's a vicious card though. Any recurring threat obviously. Bloodghast, Gravecrawler, etc. Black has a million and one ways to get additional value out of her.
Trading post is just a good card. It looks innocuous, but having all those abilities on it means it's an answer to a whole bunch of things. Every mode is useful. I've seen guys toss Squee to it and gain life to power up Pridemate's (or just to stay alive). I've seen goat tokens created to feed sac engines (that is basically a poor man's
bitterblossom effect). Sacing creatures to get artifacts back sounds narrow, but just the other day I had an engine going with
Perilous Myr and
Tidehollow Sculler. Killing dudes and permanently removing cards from hands. I can't recommend that card enough, though it is a little slow and super fast environments may not be able to afford to play a 4 drop that does nothing the turn it comes down. Lower powered and slower environments though, this thing is sweet.
Welder is a card I keep trying to break but he's inconsistent. He dies to everything. But he has a ton of potential. He may be best in a faster shell where he's not the only threat that needs to be removed (which can keep him alive longer). And then you can do mean things like recycle
Tangle Wire. Reanimator support is where I keep trying to put him but again, he's not the best guy in that simply because he dies almost every time before the engine can really come online. So I don't know. Try him and see if you like him. He's a 1 drop, so I don't feel bad when he auto-dies. That's one less removal spell for my more expensive dudes.