You all have the most disgusting luck and I could cry.

Not yet. Green attacker needs some time to get better, and a lot of good green ones are REM still (Sasuke, Michael).
Hell, ask Matsy, there's few good Attackers as is without rolling right now.
Pretty much, yeah. The only good attackers that come to mind in the grass realm is Liu Bei, Guan Yu, Sasuke, and Gaia. Marine Rider and Mari too, I guess. All of those are REM except for Gaia, which is a descend.
Same goes for fire (Ares, ROdin, Cao Cao, Asuka, twinlit ult Suzaku, Misato, ult Ame no Uzume, Freyr)
and dark too (DMeta, Gryps Rider, Hanzo, twinlit ult Anubis, twinlit ult Lilith, twinlit ult Tsukuyomi, D/D Batman, Nobunaga)
basically what I'm saying is Attacker is an REM domain because the standard farmable monsters are pretty dismal in comparison (and the ones that CAN be farmed like Lilith need twinlits and rofl good luck). It's really niche but it's totally worth it if you give it time and collect stuff slowly.
And Liu Bei makes this even more difficult by his active skill being of detriment for dark types, as well. You're missing out on a strong line of fighters when you change all their orbs away to green :v
So really Liu Bei would be pretty good if you could focus on green attackers and maybe a fire attacker in there too-- you may as well pop King Flamie in there too.