It's a bit of a balancing act between "magical" and "proper". Like it would be very easy to just have a third party control the electro-magnet via a remote con

It's a bit of a balancing act between "magical" and "proper". Like it would be very easy to just have a third party control the electro-magnet via a remote control, and it would work perfectly in all situations as long as the third party was acting correctly. But it wouldn't really be a hammer that could only be lifted by one person.