General Kaiser requires Battlin' Boxer Nova, another Xyz Monster, as Xyz Material to activate its second effect, which, once per turn, prevents an opponent's monster attack against one of your Battlin' Boxer monsters and attaches the attacking monster as material as long as you send one Battlin' Boxer monster from your deck or hand to your Graveyard
Tap my Island for a blue, casting a Brainstorm , Ponder , or Opt
On a real card, and this goes for cards from the very first set, from '98, to cards printed yesterday, it doesn't pass through until you get right close to it
All of the various options for selling bulk for that game will be listed
And of course, only big collector's will want the Black Belt promos (as it's player bulk, and I can't imagine the average collector will care), and a larger market will want the Professor's but I speculate no more than a few dollars a piece on those at release, if that