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Once during each players turn, that player may heal 20 damage from 1-of his or her benched Pokmon. Admittedly, its not great, and a lot of decks would rather run Skyarrow Bridge or Tropical Beach, but Pokmon Center does have a niche in this metagame, and also manages to counter a few things
Each containing 10 cards and 1 basic Energy
In the absence of regional Challenge events this year, Set Champs have been the only opportunity people have to get a real competitive experience, and yet, interest seems to be at an all time low
Im all for making cards like Reliquary Monk more playable in Clerics decks, and even a dedicated Clerics deck will splash out for a token Phyrexian if it means their strategy comes together better
Commons and Uncommons While it's possible for Un-sets to have "chase" commons and uncommons, much like the rares and mythics, without playability driving demand, it's the quality of the gag that determines prices