With a tapped Kalamax, you get an extra copy of that spell
These include Pokmon V , VMAX , and Shiny Secret cards, as well as previous English version exclusives and full art cards
When Lisia is in play, you can switch one of your rivals benched Pokmon into the active spot, confusing the active Pokmon, and basically handing you a victory in the ensuing fight
If they have grown a community of players and maintain a healthy card inventory through resales, thats a strong sign that they are a trusted retailer
At worst, its a three-mana way to stop a player until they find a disenchant, which can be enough to help you get to the win yourself