Fool's Wand, a cheap scam wand sold on the black market that appears to grant the untrained a staggering proficiency in magic. Every spell is cast flawlessly. However, the wand is actually feeding on the user - to be specific, it's feeding on their density.
Every spell cast makes the user a bit lighter. This is fine if you know to stop before it goes too far... Many don't. They develop delusions of grandeur around their sudden magical skills and go wild, casting spells left and right and before they know it they're pinned to their ceiling or tumbling helplessly into the stars.
Anyways any of you bozos want a wand that can make you do magic better.