I will start by looking at a couple pet cards to see how they are improved to scale into Commander
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, Turian explains
While Bankbuster is a rather mana-intensive draw spell, it works perfectly in a deck that's holding up removal mana on a lot of turns
THis one has a particularly fun effect, where you, the player, must act like a fool chicken to give the Mesa Chicken flying
If you are looking for a key card to answer something, this will help you find it
III The Brothers' War deals X damage to any target and X damage to any other target, where X is the number of artifacts you control