White doesnt have that many impressive aggro creatures beyond Geist of the Moors and black seems best-suited to a supporting role with Vampire Lacerator, Nezumi Cutthroat, and a bunch of removal, but red is designed to beat down
Theres an argument to play Liliana, Deaths Majesty in a non-Zombie deck just for the first two abilities, but were 100% flavor here
For Gandalf specifically, it helps that he was a powerful wizard, which opens up itself to lots of fun card designs, and that his character evolves significantly throughout The Lord of the Rings
You'll spend much of the early game generating little tokens, biding your time until you're able to get a key token out
Do you open the door to misprints and oddities
There are plenty of cards that let you copy the effects of cards, giving you the potential to use more than one effect