To the right of the type/subtype, there's a little symbol. That symbol identifies the set. you can look up a complete list of set and their icons online.
While I wouldn't say that Black Lotus is not magic's best card, it is it's most expensive/well known card. Magic's most powerful card (in the context of vintage/type 1, which is the best indicator of...
The set symbol in the middle-right is gold if it is rare, silver if it is uncommon, and black if common.Although, this was only brought in during the Exodus Set (Mid 1998) so sets previous to this...
There really is no "BEST" card. If one card must be picked, then it is the "Black Lotus" card (which is banned in most tournaments).Black Lotus is one of many cards that are banned from...