34 lands has seen like enough. Especially considering 15 mana rocks, 9 creature ramp, 2 enchantment ramp, and 3 rituals (or 63 slots of the deck). Goldfishing, there has been some mana-screw but mana flood, especially post commander cast, is common. Nyx Lotus is probably the weak link that could be swapped with Expedition Map or another rock, it's just a power house once Avacyn is out. Sadly there's no mana sink in the deck to make use of the mana post Avacyn but there shouldn't be too much of a game post Avacyn.

Based on goldfishing, I probably need more card draw to fuel the deck post-commander. Though, in most cases, I should win/have control within a turn or two after untapping with Avacyn.

On Grave Pact, it was a win-more card. I think in any other aristocrats deck it is an auto-include. But there are 5 Fleshbag Marauder effects in the deck, and each one acts as a Grave Pact on their own. It was cut because it cost 4 and wasn't a creature.