I'm convinced that the acid caster can handle any vicious token map that doesn't completely hose Earthmother with its layout. There are also some exotic variants involving a conversion into Mystera that I haven't experimented with because no Hard map offers a target that justifies that kind of firepower.
i think that any Codex/EM build will only be superficially related to the acid caster. The latter works by focusing all of its resources into mana and Greenblood. Once you have to start worrying about enemy damage everything changes.