In this case, all five are cheap, common-rarity creatures with an ability tied to one of Tarkirs three-color clans, and another that allows you to turn mana into a color from that clan
Curiosity Crafters saboteur trigger that draws cards and its infinite hand size effect belong in very specific Commander decks, but its such a good card in those ones
It slows down decks like Charizard, Pidgeot, and Dusknoir, and helps decks with useful Stage 1s like Gardevoir and Dragapult
Depending on how your sideboard is built, you can also play a flash game plan with Endurance, Subtlety, and occasionally Brazen Borrower if Four-Color opts to overload on ways to beat Living End
It's really hitting a lot of nostalgia for me, and I'm sure for everyone else as well