Instant speed allows you to possibly hold up other interactions while doing this on your opponents end step, effectively costing you only a single draw step to put the card into your hand
I really like the ability to apply pressure from multiple different angles
Plus, each Play Booster Display contains a 2-card First Place Box Topper
Inventory Management Chief: I dont consider myself a Fallout expert, but Im well aware of how valuable the ability to open your inventory is during a dangerous situation when playing a video game
Notably, the returned Rats don't need to be among the cards you milled, so if a powerful Rat gets removed, Ashcoat can easily get it back so long as you don't mind milling four cards (and that effect can play into graveyard synergies too)
The world is Pokemon is huge and varied, which fan favourite creatures including Squirtle, Charmander, Bulbasaur, Greninja, Arceus, Mew, Pikachu, Sylveon, Charizard, Genesect, Rayquaza, Meloetta, Zygarde, Mewtwo, Eevee, Jirachi, Darkrai, Lucario, Diancie, Hoopa, Keldeo, Victini, Manaphy, Reshiram, Kyogre, Kyurem, Magnemite, Shaymin, and hundreds more