Hi, yes there is a common bank that can be accessed from all characters on your account. You can change between your character bank and the common bank by typing "/bank" in game.
Nice! Cool to see the distribution this way instead of just littering the 0 hit rewards like most do (me included). Seems it's always le cogs that get the hit.....
Yeah that could be really fun.
The other way you could do it is have randomized "bingo" cards like this:
Or alternatively you could have the spaces be the ID/difficulty/episode.