still cant get around good old Swiftfoot Boots or Lightning Greaves, but it nullifies just about every other ace an opponent might be relying on to save their creatures: counterspells, Heroic Intervention, Mother of Runes, Deflecting Swat, Ephemerate, Teferis Protection, everything
Running a playset of Brainstorms in Legacy gives you access to 20% of your deck in card selection (if you can cast all four) while thinning your overall decklist by nearly 7%
You're managing two parallel resource systems simultaneously: Blue's hand economy and Yellow's Life manipulation
Arthur is an incredibly powerful card that allows you to earn lore with your weak questers like Lilo, Making a Wish and Pinnochio, Star Attraction, then bounce them back to your hand to keep them safe from challenges - while also rewarding you with two lore for doing it