When Pokmon-ex last left the format around five years ago, it was only fully evolved or Mega Evolved Pokmon that got EX cards, meaning they were mostly used for absolute powerhouse attacking and defending capabilities
Admittedly, Liliana sees less play these days but remains a powerful option if you play Jund, Reanimator, or Rack strategies in Modern
A surface level, the rarities determine how likely you are to find a card overall
All WPN events can be found using the Wizards Store Locator
Instead of doing a deep dive on Tiamat (look at the Ur-Dragon page, its the same deck) or even Xanathar (everyone is bafflingly building a mill deck, I guess to optimize what one card you get?), I think Im going to do a real shallow strafing run through everything to get the big hits out of the way first
I guess taking a date to a breeding ground for microbes is kinda suggestive