Hello Andy,
gonna make it short:
#1 Add some kind "Swipe all" or a way to pick an amount of Cards (of the same type) to swipe at once. Why?
Holgar, 300 rounds without swiping... My fingers startin to get blisters...
#2 When enough Cards are swiped, they new Card gets shown to you and the focus goes back to the Card you have been swiping IF there are still some available.
Every 2 potion you have to go back and forth XD takes so much time XD
Guess at least #1 was asked for a few times already =)