Maybe one of the ciridian(?) (phone won't let me spell it) Otherwise probably just the doomy as Ohmin said.
i gave them a look over now i'm home and nope, though i think the arcanist maybe once did. just the doomies then i guess.
Not that I recall. She did have Adaptation as an (often ignored) option once I think, but I could be wrong about that. Hurray for Pox naming convention.
Doombringer. Firk paraform. Firk Infiltrator. those are it i think unless im forgetting something. used to be more.
The doom bringer with domain water or bounce and then blind dose not look like a bad build. With Marsh songs and cleaning mist spamming I could see the doom's damage getting up there fast. Maybe like a beast/aquatic theme could work with the adaptive doom and the spells i like to spam. If it is an aquatic theme, even beast theme you still can get your hands on fry and drown. Of carouse Jellebrium Overmind with creative+ an adaptive is what I am interested in.
I don't normally like it, but if you're going with Adaptive and Overminds, you might consider Nora Weave instead of Marsh Song. The extra expense means your Doomies will get some extra HP, and with Creative you can more easily have a much greater uptime than you normally would, which limits counter-play options, and potentially gives you much more nora overall. I personally wouldn't worry too much about "themes" for this sort of thing. Or at least not themes specific to Doombringer. For example, you could plug him into an otherwise Jellebrium theme, since you're running Overminds regardless. Alternatively me and @doubtofbuddha had a discussion not too long ago about potential meta decks including the new runes, you might be able to modify or take inspiration from one of them. No worries mate.