The ones with the right creature types have priority, and I think its hard to argue against Kytheon, Hero of Akros
That's only given they sell their cards for the ongoing pre-order prices
Creatures (33) 4 Llanowar Elves 4 Elvish Mystic 2 Cultivator of Blades 3 Verdurous Gearhulk 4 Servant of the Conduit 4 Minister of Inquiries 4 Walking Ballista 4 Emry, Lurker of the Loch 4 Merfolk Secretkeeper Lands (21) Spells (6) Its unclear if the Verdurous Gearhulk and Cultivator of Blades spots are better than alternatives like the Combat Celebrant package, but Im always a fan of keeping the manabase as clean as possible
For our purposes, I also include red and green cards that have an adventure of the opposing color
When initially using a sequence length of 180 (instead of 360) packs to model this set, I came across the following problem, which was one of the reasons I opted to rethink the way I was modelling the sets (the other being that a sequence length of 180 packs just didnt give me enough flexibility to get my models to fit the raw data well): As Ultra Prism is a large set which requires two 11x11 sheets to print the reverses, assuming 3.0 Prism Star cards per box would mean a sequence of 180 packs would contain 15 Prism Stars, leaving 165 - an odd number - for the reverses