Fun : This is where most commanders fall
Stackable Design: Maximize your display space with a smart, space-saving design that allows you to stack your cases securely and accessibly
For early WotC-era cards specifically, watch for: The light test: authentic cards have a thin black inner ply visible at edges or when torn
What are the weaknesses and retreat cost of this Avalugg card
That said, Im sure that outside of the two big Fossil errors (and Base Sets weird 1st Ed stamp misprint, where its on the back of the card), its mostly just smaller misprints, not repeated on as wide a scale and thus not as well documented
All three of my black choices happen to be four mana midrange bombs, so this has a lot of competition, but the sheer amount of stats on this thing scream playability to me