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
That's a bit too restrictive to always do, so we look to other options
Without a flying creature, your opponent wont be able to stop you from adding counters to anything you want
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
You're managing two parallel resource systems simultaneously: Blue's hand economy and Yellow's Life manipulation