At GP Memphis, I had a situation that I've been thinking about a lot.
I played Ari Lax's Naya Monsters deck (with shouts to Bobby Fortanely, Ethan Gaieski, and Scott Lipp). Despite how I felt about it after day 1, I think the deck is at least fine and probably really good. Knowing what I know now, I'd certainly make some changes, but having been partially involved in the development of the deck, I still believe the theory behind its construction to be sound.