Toluz clever conductor
It focuses on discarding my own hand to toluz with effects like skirge familiar and mind over matter to make loops killing and recurring toluz while things like syr konrad and bonemiser are out to just dig and grind everyone out
Mmmmh, then I won't point out a single card, but a category of cards, with a couple particularly interesting examples.
There are cards that can discard themselves for a spell-like effect, either through a Channel ability, a random one off or when they cycle. While it does cost mana, it can be of great effect. Simple cycling effects can draw cards or find the lands you need with the cheap cyclers from Ikoria or cheap land cyclers from LTR, but we can do better.
How about a bad counterspell you can reuse every time you reset Toluz? Or a bad instant speed removal? These two are particularly nasty because once your opponent knows you have them in hand, it'll mess up their plans big time if they want to play around it. Always leave up three extra mana when casting spells? That arranges you. Never get into combat with anything that doesn't have three more toughness than potential blockers? That arranges you. Harvester of Misery isn't even a bad card on the front. It does kill Toluz (oh noes) but it also empties out a board of tokens. Hell, Harvester can even be used as a pseudo-sac outland for Toluz from hand if you have stuff to bring her back lined up, since you can discard it to give her -2/-2, and it'll get exiled by Toluz before the ability resolves, and go right back to hand. With a Bone Miser, you can probably turn that into an infinite loop somehow.
There are also worse versions of those effects from older sets. I don't know if these are worth a slot but it's good to know they exist. The ones with Cycling are pretty weak but at least draw an extra card.
And finally, the funniest card of all, which isn't actually good because you won't need its ability by the time you can actually make use of it for profit, but...
Which you can just discard whenever by itself to do nothing. Unfortunately, I would STRONGLY ADVISE AGAINST playing it even if just for the memes, because if you do, Graveyard Order matters in your game, and you do NOT want to have to deal with that, particularly not in a Toluz deck that constantly gets things in and out of there.
Edit: Oh yeah, after the fact I also remembered Spellshapers existed! Most of them are a bit too clunky to use and threatening to opponents, but they're also options. Shoutouts though to Undertaker.
This can get you back a creature that wasn't discarded while adding to the Toluz pile... Or get you back Toluz after you sacced her if you're out of other ways to get her out of the grave, all for a very affordable cost.
