there should be a search button in the arena for when you want to face certain people in the arena. It'd be especially good for checking out someone's deck before recruiting them.
why did everybody downrate lordc's comment? he's right about that. @DANzam: *trollface*
sharing decks would be cool, but trading would be better. but you know what else would be cool? being able to purchase card packs without worrying about being ripped off! this is the second time I've purchased a gold pack and it went wrong! only this time, it gave me the cards, but took TWICE the amount it costs!
 "Bullet Audyssey"){kind=icon}
 "Tasty Planet: DinoTime"){kind=icon}
 "Backyard Monsters (removed)"){kind=icon}
 "Tyrant"){kind=icon}
 "Haunt the House"){kind=icon}