--Zephyr Boots is a very good update from the
Kitesail dropping the auto-equip for a saboteur
loot is a trade I'd take any day.
--Star Pupil will more consistently give its
counter to a creature than Venerable Knight
since there aren't very many knights in the
cube. The loss in power is regrettable however.
--Losing another Savannah Lions type card in
Soldier of the Pantheon. The multicolored text
rarely came up and was essentially flavor text.
The Stonebinder's Familiar has many more cards
to trigger off of and is better off a single
trigger.
--Tormented Hero is a bit of an odd ball since
black rarely wants heroic type cards,
preferring to play with graveyards. Adding a
card draw and another menace creature should
still fulfill the black aggro needs.
--Flame Jab is just so much worse at its job than Molten Vortex and you really only need one of these types of cards. Team Pennant will likely get more damage through from game to game anyway.
The snarls are the completed set of lands from Shadows over Innistrad and aren't going to make the cut for the same reason. Tapped lands are pretty not great, even if they have a condition to come in untapped. The Campus cycle are interesting for a tapped land cycle. I think the activation cost is simply way too high to make the cut into this cube.