The sets which had a 1st Edition print run are Base Set, Jungle, Fossil, Team Rocket, Gym Heroes, Gym Challenge, Neo Genesis, Neo Discovery, Neo Revelation and Neo Destiny
It is a good idea to have a common that you know is legitimate from the same set when doing side by side comparisons
Its not legendary or an enchant world or anything else self-limiting, so you can load up
It turns the Phoenix matchup into a great matchup and it turns Control from unfavored matchup to a favored matchup
Unlike the other cards mentioned it is a one-time effect, and it is conditional on being on the losing end of a major combat or board wipe, but its also card draw in Black that doesnt cost any life in order to obtain them
The deck runs a lot of situationally great cards, from Nihil Spellbomb to ruin Reanimator decks to Silumgar, the Drifting Death locking down Go Wide strategies