Thanks everyone, and especially Dan for running!
I'd never played this variant of Infinitor before - it was interesting! It felt a little like playing against the Dreamer, but honestly a bit easier since as a hero target mass damage cards were still available.
That last sequence of the Adept's is what I love about Arcane Adept. He's one of the most complicated heroes in the game, but the flexibility he gives is just amazing. Paired with someone else who can give out-of-turn power uses (thanks, Captain!) he becomes almost broken.
I think he's just beyond my comfort zone for complexity. I really enjoy more complex heroes like Nightmist, AZ and Harpy, but I've never felt like I can get the hang of using AA effectively.