This Booster Pack contains cards like Dragonite VSTAR or Mewtwo VSTAR (Regular and Secret Version), Rainbow Cards, and of course, the Radiant Venusaur, Blastoise, and Charizard cards , as well as the infamous PokeStop Stadium and Snorlax cards that are often used for the Stallax strategy
So having one black star means that its a standard Rare card
You also arent benefitting the most from oozes that mimic other creatures abilities or that base their power and toughness on your other creatures MV, P/T, etc
If you have multiple Barnes & Nobles in your area, I highly recommend checking them all out to find out which one has the best selection
Like most Magic: The Gathering cards, the value of Unstable Mutation depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Foreign Black Border)