The Ebony Fly seems pretty useful. Price is comparable to mind stone. While it ETBs tapped and cannot be used for immediate value late in the game. Getting a flying creature that gives another creature flying seems like a decent alternative to just "draw a card" for some decks.
Ebony Fly is almost exactly a Guardian Idol but outright better 83% of the time. Even when it's a 1/1, it's evasive and grants evasion. Every deck that wants flying on a single creature should consider this card.
Edit: Oh wait, it costs 4 to animate. Still pretty impressive.
I for one appreciate that there are only 4 ETB tapped lands in this precon, one of which is always justified bojuka bog. Combining that with the fly, stone, talisman, and signet, this deck has a legitimately okay mana base by the standards of commander precons.
Bucknard's Everfull Purse seems like an improvement on Tempting Contract, albeit not much of one on a pretty low power concept. The smart move is still usually to just not use it, but at least there's enough temptation to get someone who's desperate.