Like most Magic: The Gathering cards, the value of Power Play 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 (Conspiracy)
But then, we have the Overlords from Duskmourn: House of Horror and some big guys from other sets (including MSH and Teenage Mutant Ninja Turtles ) that are also too evil
As Xyz Monsters do not have Levels, Xyz Pendulum Monsters usually have a condition that allows them to be Pendulum Summoned from face-up in the Extra Deck if their original Rank matches a Level whose monsters their possessor can currently Pendulum Summon
It is essential to keep in mind that cards that have been played with are less likely to achieve high grades
Once you get into the groove of your lock, use Penny / Professor Turos Scenario to clear clutter from your Bench, and take away easy Prize Cards from your opponent
The Saturday Challenge is the first result, the Sunday the second on the table
