At its most basic, the argument for Fallen Empires is that it would create a great influx of playable decks, that it was released in 1994, and that it is the last of the old school "stand-alone expansions" (it came before the block structure we've had since Ice Age/Homelands/Alliances)
For example, we'd been looking for ways to integrate the set with technology (with cards like Mobile Clone and Photo Op)
Pokemon has a huge presence on whatnot and is definitely the best place to have fun while the sellers break into packs
Shiko and Narset, UnifiedShiko and Narset, Unified: You have good opportunities here for jank with mutate, and there are some weird spells out there that target (like Illicit AuctionIllicit Auction)
Don't say it
Typically, the poker card sizes, bridge-size cards, and many more playing card types have a standard 1/8 inch corner radius