Speed is a slang term used to describe timing restrictions on different types of cards
Popular commanders where Far Traveler is in the 99 include Preston, the Vanisher and Elesh Norn, Mother of Machines
This black Oblivion Ring is the kind of card that draws people to play Commander or Pauper in the first place something offbeat and interesting that you cant play anywhere else
Look out for unique Saga Creatures and double-faced cards in the set
However, the design of these three is great where they all fill a similar role, are similar power levels, but have some key differences, so it will be deck and meta dependent for which one is best in a given situation
Terror of the Peaks might be the weakest of these three for this deck, only letting you do damage equal to the entering creature's power to any target