Then read this i guess
http://www.bluelight.ru/vb/showthread.php?t=140341
Then research well on the ones that sound interesting to you.
There is info here in PD and off-site about how people tend to react to it, and what is known about potential acute or long-term effects. Then calculate that the least novel (longest available and used ones) 'amplify' safety score if few or no true toxic or adverse complications have been reported. Beyond that, it's the unknown factor any RC or even any other drug has... so the only thing that makes a RC "some random RC" is lack of research the result of which is reassuring or comforting enough for your standards.
Please do not ask about getting or finding drugs any more since that is absolutely not what this forum is for (thats your own problem sorry), but yes RCs are available online but seem to be becoming slightly more scarce.
In my opinion the safer options seem to be the novel lysergamides (not LSM-775) like 1P-LSD which should turn into LSD in the body.. and 4-HO-MET or 4-AcO-DMT both of which in their own way are closest to psilocin. 4-AcO-DMT might in a terrible scenario be a legal problem, if some of it degrades to psilocin which is illegal.
That they are so close helps with safety although is not a guarantee. The more new and freaky synthetic you design a drug, the less can be guessed about effects, safety, toxicity etc.
On the other hand, if you go a bit further away from those close analogues - you have a better chance of getting out of a potential legal case, since with analogue laws they could make life hard if they would really want to. Also depends on exactly what state or county you'd be in.
Just don't order big quantities, most likely they will throw it away if they intercept it and warn or notify you in a letter.... it's not worth the cost for them to go after some guy in court who just ordered a small quantity of an RC.