How to deal with damaged cards from a MTG booster pack?
Wizards of the Coast has a process you can follow for the replacement of defective products purchased, described in detail on their website:


  If you purchase a product and find that only one or several cards are damaged, defective, or missing when you open it, please return any damaged cards (if not missing), and follow the shipping guidelines provided above.  We'll replace the exact cards for you.