The Halfling could really push casual tables around as a one-drop tapper of mana, even colorless, but it's very strong in Commander since so many things are randomly legendary without even needing a theme to toss it into
I think that it is still very powerful, but for whatever reason, it has fallen from favor although perhaps the reprinting of Rewind from Core Set 2021 will give it new life
You choose a nonland card from it and exile that card
The deck can be built on a low, low budget if needed
If you build your deck right, thats going to win you the game almost immediately
The Brothers War picks up right where DMU left off, with Teferi somehow opening up a portal to the past in order to try and figure out how to work Karns Sylex, rebuilt by Saheeli