You're given the choice between two superpowers.

After you accidentally save a witch's cat, she offers you the choice between two superpowers. The first choice is a power known only as "Revive;" you can bring any in-tact corpse back to life by giving the corpse CPR with direct mouth contact for two minutes. The second is "Polarity," which will allow you to control magnetism within a 100 meter radius using your mind. Which do you take?