Forget about JHow, Scorched, Siphon and Parasite. This thread is for the terrible cards that you love but now won't get to play (or try to think of a way to play) any more.
Alpha & Omega: These were really cool but underpowered. Instead of dividing ice by type or strength or server, they looked at the position in the server. Some corp players don't plan on making deep servers to avoid the increasing install costs. I forgot they were on here and was planning an Alpha + Spear Phishing deck.
Big Brother: As many pointed out, runners with tags usually ignored them or died right after getting them. But if you had been in a situation where the runner was trying to clear their tags, this would have been so strong.
Chimera: Not jank, but I definitely overused it. Paying repeatedly I can handle. If it ate a Parasite after keeping the runner out once, I guess that's just Parasite for you. But SMC basically negating this card's whole advantage made me sad. And there has been no replacement card to tell the runner "go get a full suite or an AI for this" (I like Changeling though).
Djinn: Also not jank, but I used it where I could. Saving influence compared to having another Medium, and also adding the consistency of being able to tutor up a Crypsis in an emergency, was surely worth a click and a few credits. Not everyone agreed with me.
Edge of World: There are three ways to use this card, and none of them worked. (Never advance, run it alongside must trash assets, or use whirlpool and deflectors / aginfusion to force the runner into it). I have been killed by it though.
Janus 1.0: Who can resist wanting to use the biggest ice around? Even if you paid the full rez cost rather than cheating it out, the runner still had a lot of options to deal with it.
Kraken: All I wanted was some immediate and influence free ice destruction. Couldn't they have spared this considering we just lost Parasite?
Starlight Crusade Funding: Before we knew that there'd be a rotation, we always said "eventually there'll be enough doubles in the game to make this worth playing". If they ever add a Legacy format, maybe that will still happen.
Tsurugi: I paid influence for this ice that others wouldn't play in their Jinteki decks. It was perfect to me: $4 to get through with Mimic, 2 turns to kill with Parasite, hurt people on facecheck (only if you let them through and paid $1 though), or kept them out if you needed to protect something important. There is no substitute.
Wyrm: I always liked this because it could break almost every ice (except Lotus Field and Swordsman) with credits alone, not requiring a special resource. Still, I knew it was inefficient and always had something to help it out, like insta parasite https://netrunnerdb.com/en/decklist/37378/androwyrm or e3 https://netrunnerdb.com/en/decklist/32871/nexus-quetzal