My SR list. Based on stats, rarity, avalilbilty, trades, and reason.same tier does not mean same price, going from left to right, right being the most expensive.
High: bloodcloud gargoyle,hydra, ancient lord,Flamecloak dragon, zombie dragon, white tiger.
Mid-high: crystal golem, shenlong, (perfect) aquilonia, dust dragon, carinia, dragonewt, orochi, Burnclaw Cerberus,mikhail, harlequin lord, Black centaur.
Mid: Darkslime,aquilia,KoD,azure,(perfect) Posiden,chi(decent, about 5k+ attack), golden rukh, hellwyrm, catoblepas.
Mid-low:Red bird of summer, serpetina, kirin,megalodon, crystal giant, black turtle of winter,queen lamia.
Low: ash dragon
Q&A without Q: I feel every SR has its own purpose expect ash, no matter what happens it position will never change, it's worse than most high tier rares. The reason you might see beasts a little higher in this list than others is because there extinct, endangered(with the exepct of megalodon) whatever you call it. Red bird is very low nowadays, the boosters destroyed its value, mushi was able to pull 5+ alone. Black turtle is near extinction so it's pretty high for now, it's skill and stats(def is ok at best) are still bad. Azure,kirin, and hydra were also destroyed with the boosters, With the exception of FCD, i dunno what happened there. Cato is the highest of mid due to the fact that nobody is trading, they overvalue them, it's stats are ok, it's skill is outclassed but for a warrior SR that's not Availble thru events. I didn't put event SRs in this list since they go from tradable to untradeable in a blink it's not worth posting. BC is overvalued, yes in the past people did trade them for high, I do recall myself doing a 1:1 for a FCD at the time idoharm was trading crystal golem for a zombie dragon, any SR=any SR back then, times have changed, they are common and undead booster has yet to be released, I suggest waiting. Cairina is very high on my list compared to others due to rarity and demand, it WILL move down when boosters are released,enjoy them for now. Bcg is the lowest of high tiers, at one point it was traded highly, etc. , etc. I may have put hydra a little high only because they are like many other SRs OVERVALUED. To many people don't realize, in the words of logan5 "hydra is just a glorified batpard". Bcc is at mid-high tier due to rarity, even though only having one is worse than fuse+ Fenrir or firemane, there's not enough out there. Monsters that aren't perfect(with the exepction of chi, making that perfect would create a madman, kudos to you JR) has almost no value, nobody wants non perfect expect those with no SR. Some may disagree that I put white tiger higher than zombie, well theres is some reason behind that. First, zombie's skill is horrible, I believe change is underway but not 100% sure until then. Secondly, white tiger is more valued by players, choken payed 2 FCDs for his before boosters, I'm willing to pay 2 ALs for one, gannon is offering 5 mid-low SRs for mine. These are facts not opinion. Zox also went around trying to get 2 ALs for his ZD and no biters. Of course there's always someone out there that might offer a bit more for ZD, as of now these are the facts, I've never seen an offer of more than 2 hydras for one, after booster.darkslime is mid since mint DMs were very annoying and there was a demand of debuffers, I recently traded my darkslime for an azure, I feel I got screwed over.KoD is pretty high since it has some value to those with HL. Newts have also been in demand since their fusion+ is dragon legion and there getting pretty rare. Orochi has been put in its place, it's rare nothing else. Sorry for the messy format, this again is my list based on facts, trades, rarity, stats, etc. if you have any questions/comments feel free to reply, I'm ready to get some mixed opinions.