Everyone should be able to Practice with a 5-Card Deck. Sometimes you need to try out a 5-Card Deck before you go out and lose with one that doesn't mesh. Just a suggestion.
I finally got the BFT after more than an hour of playing in infinite mode; at that time I had 6278 bubbles collected and 1353 enemies killed. Hope that helps those trying to get it.
 "Kongai"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "3D Logic 2: Stronghold of Sage"){kind=icon}