Yes, a shop with exclusive shop cards would be great. I can't help but compare kongai to Pokemon as I'm a big fan. The cards you win in the weekly contest would be like Articuno, Lugia, Celebi.. once in a lifetime chances. For the shop, it'd be like the Safari Zone or the ones you could buy with the casino coins. The only way you could win these special weekly cards, is the 2% that's already established.
most of the time I don't see the image of the card I'm using (don't see the guy up there fighting). Specially if it's the first one, like the one that comes up first.
 "The Enchanted Cave"){kind=icon}
 "Pixel Legions"){kind=icon}
 "Creeper World Training Sim"){kind=icon}
 "Bunny Invasion 2"){kind=icon}
 "Pel"){kind=icon}
 "Little Wheel"){kind=icon}
 "Music Catch"){kind=icon}
 "Zilch"){kind=icon}
 "Hanna in a Choppa"){kind=icon}
 "The Visitor"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Typing Ninja Hunter"){kind=icon}
 "IndestructoTank! AE"){kind=icon}
 "Kongai"){kind=icon}
 "Synapsis"){kind=icon}
 "Doeo"){kind=icon}