For cards that instruct you to roll a d20 and have results tables telling you what that means, this can cause the die result to be higher than any of the results on the table
Later, you can copy something much larger so that when you connect in combat, you get a bunch of energy at once
Vivillon disrupts opponents by reshuffling their hands, while Decidueye ex takes advantage of that disruption to deliver high-damage attacks without energy cost under specific conditions
Change of Plans sees play in 13,437 decks, while Lethal Scheme appears in a whopping 40,936
One trigger can push multiple planeswalkers straight to their ultimates
It seems likely that this extra layer of difficulty in getting hold of the cards, in a situation where that was already close to impossible thanks to scalpers, could be driving up resale prices