| Dude, seriously, just take an exacto knife and cut the bubble off around the edges--leave the glued part on. This way you don't ruin the card art by tearing it or anything.
The only real downside is that there's like a quarter-inch of raised glued plastic part around the edges of where the bubble used to be, but for one thing it's barely noticable except under direct light--and I just display my cards covering up that bit anyway (because a big silver spot looks kinda stupid anyway.) | 
