An argument could be made that Library deserves spot #2 or #3, but nobody who has played Oldschool and faced a first turn library would place it any lower on the list than #3.
Unlike the Art Sleeves, which have a glossy, untextured back, the Standard Solid-Color sleeves have a bit of texture, which makes shuffling easier
Quick Draft has you drafting with bots, then playing best-of-one with other human players
(Same for Keisuke in the HM manga)
The Ruby/Sapphire starter deck leans heavily into the Dual-Ink mechanic that Archazias Island is really known for, letting you leverage fun and creative combos between a diverse set of cards
Regardless of which one you choose, however, Metal Saucer is a crucial part to any Metal-oriented deck