I liked some of those cards, so much so that I kept the most flavorful ones functionality identical (e.g. Tyrion).
The set is also inspired by the original MTG "Legends" expansion. All legendary creatures are at least 2 colors. Key POV characters are Rare, others are Uncommon.
There are a a couple "cycles" as well including
* 6 well-known Dragons * 5 "Maesters" (all blue, plus one other color) * 5 legendary lands that produce color mana + 1 special ability * 5 well-known pieces of equipment * 5 legendary lands that are non-mana" abilities.
There is also a 7 cycle set of game-warping Sorceries based on the title of the books: