If you're new, Craterhoof is one of the best closers in MTG and has dished out many a loss in Commander since it was printed
Aminatous Augury: A sorcery that allows you to exile the top eight cards of your library and cast spells from among them without paying their mana costs, providing significant card advantage and tempo
Varchild, Betrayer of Kjeldor could be fun in some sort of group slug deck where you give your opponent tokens but in a harmful manner (maybe with something like Trespasser's Curse on the battlefield), although she might be better in the 99, since mono-red is pretty limiting
This is a great roadblock against decks dependent on curving out their commander before doing anything else, and it shuts off some sources of card advantage
This cards ability has also stood the test of time, as it has been reused across multiple cards, including on the semantically linked Fungus Sliver from Time Spiral
This elemental bear still brings them all back as part of its enters ability