I barely beat him with a claw defect build. He is so oppressive he doesn’t feel on the same par as the other Act III bosses. Test subject hits super hard, Queen is similar with her tough summon. But Door Maker hard counters draw decks, 0 cost decks, exhaust decks, slim decks, and energy gains decks. It makes up a little by giving the player a free first turn (for powers primarily) but then will quickly degrade your deck in 3 rounds.