As mentioned, it being an exile turns off so many strategies, and being able all of the most common permanent types, bar lands, means it's an emergency button that ultimately slows games back down to a crawl
Now that the format has developed further, the competitors at Richmond are going to have dedicated a lot of time to Limited and will certainly be bringing their best to the tables as the Draft rounds carry a ton of weight for the tournament
The Book of Exalted Deeds I think Im keeping the Book around for a while to create all those Angels, but eventually turning one of them into Platinum Angel will be good as well especially if that Angel is Avacyn, Angel of Hope or anything Aegis Angel is taking care of
Mercifully, Stock Up is still technically a fairly cheap MTG card, all things considered
With Vigilance and Reach it is a great target for placing +1/+1 counters with Ayula, Queen Among Bears and its last ability, can even help us with ramp and have great synergy with Ayulas Influence as we can firstly discard all the lands from our hand to create an army of bears, only to return them with Lumra, Bellow of the Woods and get great profit
Go ahead and run a few ways to nuke graveyards, like Soul-Guide LanternSoul-Guide Lantern and Rest in PeaceRest in Peace, to help you out against graveyard decks in case you have to deploy your commander before your big, life-gaining, game-winning turn