complete pokemon base set 102 cards Wizards of the Coast Common Card #52/102 Machop : Toys & Games you may attach 1 Water Energy Card to 1 of your Water Pokemon 1999 Pokemon Complete Base 102

In addition, many of the most popular trading card product lines still provide collectors with ongoing opportunities to collect through the creation of new products that produce a sense of scarcity (i.e., limited printing quantities), attractive physical characteristics (holograms), premium (high-quality) product materials, and product lines or brand expansion for major trading card product lines (e.g., Pokmon, Magic: The Gathering, Yu-Gi-Oh)

And we likely haven't seen the last of them yet.

except these force each opponent

Consider the other three- and seven-defense battles, Invasion of Zendikar and Invasion of Alara