It seems likely that players are looking to collect one of every Nazgul, so they can have the complete set in their decks
Goldberry, River Daughter wants to move time counters off of Rose Tyler and move them onto permanents with vanishing to keep them around, though we can also use Goldberry to remove time counters from our cards with vanishing where appropriate
It requires your opponent to have more cards than you to be a cantrip, but its solid value if you can hit all three modes
As you probably know, one of the fundamental laws of Commander is that you can only have one copy of each card in your deck (barring basic lands, of course)
Fishbone Quill Fishbone Quill is a neat little Sapphire item that serves a lot of different uses
If you can talk to animals, you can ask a nearby sleeping bear to move off an elevator, which takes you to a certain squirrel and a fun interaction