Why do people talk about Tom Bombadil like he's the boogeyman?

My gf is relatively new to the game and decided she wants to build him. The way I've seen him talked about, I know there's more to it than just tossing good sagas in a wubrg deck, but I have no idea what the secret sauce is. What are your best combos, auto includes and hidden gems? Let's see your lists!

Edit- the consensus seems to be: fuck Tom Bombadil lol