2x Mark. 100 Life. 1x draw.
Rewards as it is now (3 spins).
ALL upgraded cards. (main source of reward)
Optimized, strong decks. (Unlike FG decks which are pretty unoptimized)
(No, I won't post decklists. There is no point. We'd need at least 20-30 of them anyway, and it's better to start making them AFTER it has been decided how many draws/marks etc, not before. Draws and Marks are a primary factor in designing the decks, and I assume all HB will have the same amount after they get changed...if they'll get changed at all.)
In short, no advantage for HB except +1 mark, but stronger decks than what an average FG has.
Yes, that'd make the AI 5 both easier and more rewarding than it is now. Which is a good thing. It'd make HB the main source of farming (which they should be, being the highest AI level intended for farming) to replace false gods (which are intended to be a challenge and not a farming target, but they are because everything else gives too low rewards)
False god rewards should be somehow increased, or at least changed. HB should be the main source of electum/upgraded cards in the game, and FG should be reserved as a challenge.