Individually these effects are marginal: but combined they form a card that was so good, many non-red blue base decks started playing red just to get it (plus Flametongue Kavu, to be perfectly fair)
I know they were used by professors to help promote the game at the beginning, but I do not know how common they are or how they compare to things like 1st Edition Base and Shadowless
In a deck featuring Yorion, Sky Nomad, the pitch cost of Solitude changes to three colorless mana. The modal casting cost generated by having a companion has become an integral part of Modern
I wouldn't have an issue if you ran it against me in Pauper Commander since it's a one-of, but your milage may vary
Its harder to care when the world is defined by forces of nature and not people (and their reactions to living in such a world)
Bello, Bard of the Brambles "The ringtail bard," "the trinketmaster," and most recently, "the omentrotter." These are just a small sample of the monikers Bello has earned over the course of his journeys