^^ I've also heard DOC, DOI and 2C-E advertised as "mescaline analogues": At least it proves some people have a better imagination than others. Most just call them "it's acid cuz it's on a blotter."
That being said, 2C-E doesn't fit onto blotters in any meaningful doses: Yet it is ~5-10 times more potent than mescaline. This really doesn't leave much room for doubt: It's either one of the DOx compounds or one of the nBOMEs. If the latter, i would not recommend combining with anything; Or even taking it by itself really. Disgusting shit. Doesn't work that nicely with LSD either.
DOC / DOI are pretty safe, the rest of the DOx compounds slightly less so: Actually i used to really enjoy DOC. Especially when combined with LSD. It's the most DMT-like thing i've ever experienced besides DMT if you combine these two. I don't understand why. It does last much longer.
If you can verify it to be, let's say, DOC, i can with some reservation suggest the combination with LSD: The intensity is really something else yet the body load is so miniscule during the peak it can perhaps be a bit too ego-death inducing to some. The LSD will however eventually wither away leaving only residual DOC left: It's a shame their durations really don't match at all.
TLDR: Overall, most phenethylamines are safe with LSD: Assuming they are safe to take by themselves in the first place. LSD is incredibly safe physically. They do however seem to get an exponential increase in intensity for both substances: If you take let's say, a small amount of DOC combined with a small amount of LSD; It'll likely feel like a MUCH higher dose of both. So, not for everyone.
That being said, what you have is definitely not mescaline.