I would equally like to see MXE and AMT again. AMT was still available til recently but no longer, I only have 1 dose left and I fucking love AMT. Also MXE... it's weird because MXE isn't even illegal everywhere but no one is making it. But damn MXE is special, it's consistently one of the most astounding and magical drugs for me.
I never liked MDPV, made me feel cracked out as fuck, anxious with a racing heart. I loved methylone though, I'd really like to see it again. There is still 4-MMC out there, in fact I'm supposed to get a bit soon. Which is cool because I only tried it twice, and the first time I was blacked out on benzos so I don't remember at all, and the second time I only had 250mg total so I didn't see its full potential.
I'd like to see the 2C-Xs be more available again, as the vast majority of them are excellent drugs. There are 2 available that I know of at the moment, and also darknet 2C-B which will probably always be around as it's pretty much transcended "RC" status. But 2C-T-2, 2C-T-4, 2C-T-7 and 2C-T-21 are all great drugs but long gone. Luckily I have a big ass collection so I have some of them, including a gram of 2C-E. I don't know where that is anymore either though. 2C-E is one of the finest and most powerful psychedelics in existence and it would be a shame if it totally disappeared.
LSD is LSD. It feels like the mushrooms I get now aren't the same as the mushrooms I got when I was 18, but it's just because it's not new anymore. I've grown and changed, tripping itself is different for me. It's true that for years, there was very little real LSD going around and it was mostly other things being sold as LSD, but for the last few years the market has been flooded with good, cheap LSD that's the same as it ever was.