Tireless Tracker has long been one of the best green creatures, and it just so happens to hit right under four mana for Collected Company
In that sense, he's a character that is approachable to both old and new fans, and the fact that so many people keep coming to me asking for 'Sephiroth
Cheap, and a fantastic way to keep your Commander on the battlefield for longer, even if you've got no other artifacts in your deck, it can be a good move to put a Swiftfoot boots in there somewhere.
For this reason, its both the rarest and most expensive MTG card
Its in a similar design space to commanders that give your creatures blitz or something like it, though you're never down the creature card
Permanents with ETB abilities are welcome, like Omen of the Sea and sagas like Binding the Old Gods, and Yorion can also blink planeswalkers to reset their loyalty counts