(Though I'll end on a slightly friendlier board since people hate that...) It really feels like a Pendulum theme
Drawing Cards Every precon ever printed has always had effects that drew you cards, but theres a noticeable upward trend of making sure drawing cards can be tied to your Commander so you always have access to it
Identifying each card by hand, looking up the set, the number, comparing across several marketplaces, takes hours of work
Synchro MOnsters Synchro Monsters can be Synchro Summoned by using a monster called a Tuner, plus other monsters that have a combined Level that equal the Level of the Synchro Monster
Crimson WispsCrimson Wisps and ExpediteExpedite are functionally identical cards, and the ability to provide haste to any one of our creatures (particularly a creature with an instance of double prowess), can be game-ending when combined with BriaBria's ability to make one of our creatures unblockable