These cards are designed to be printed on 4x6 index cards. To make them reusable, place clear tape (I use packing tape) over the Hit Points and Spells areas. Then use dry erase markers to keep track. When you're done, wipe them clean and use them again!
Of note - I completely statted out Jarovar, rather than just give you the information in the scenario. However, I did ALSO give you that material on the card.
stat_cards_-_shadows_last_stand_ii_-_web_of_corruption.pdf