After finding the Pokmon cards among several of her old items, she got curious
You sort by type first (all 12 Fire, Water, Lightning, Grass), then by evolution stage within each type (Basic / Stage 1 / Stage 2, in both holo and non-holo), then break out trainer cards and energy cards separately
As products like Prismatic Evolutions continue to push the boundaries of what's possible in the Pokemon TCG, older sets like Cosmic Eclipse continue to catch up to the leaders
You can be sure swapping these wouldn't disrupt your deck
Some players like to build powerful cubes with lots of combos so it'll feel like playing Legacy or Vintage
This basically means that your table agrees to allow you to play with the MTG My Little Pony cards