Nothing at present. If I have some time tonight, I’ll capture some simulacrum fun against some level 85 bombards, heavy gunners, and elite lancers. (I’d heard bad things about Ash, too, and was resigned to using him for mastery fodder. I was super-surprised to see him actually effective.)
I also really, really enjoy Limbo, and as an added bonus, he has an easy way to cheese the Plains of Eidolon drone escorts. Banish the drone! The Grineer will still attack it and not you, but they can’t do anything to it. The rift plane generally is a fun mechanic, even if there are a growing number of things (grr) that can attack you across the boundary.