what does ex mean on pokemon cards gxs and exs the Return of Pokémon-ex Means for the TCG Pokémon ex (TCG) - Bulbapedia,

The pricing tends to be very close to if not a little better than purchasing it in a store

They are restricted too, so also only one copy can be in your deck

Pokemon 151, Black Bolt, and White Flare are considered "specialty sets" and here's what you need to know about specialty sets

It acts like Poison in that it consistently chips away at the afflicted Pokemon's HP every turn until healed, though it does 20 HP worth of damage per turn instead of Poison's 10 HP damage-over-time

Upon announcement, it was heralded as the next Evolving Skies, with many doubters

With all the different Magic: The Gathering cards and mechanics out there, youre bound to come across a strange theme to build a deck around