Of the things I use for pottery... probably the flexible stainless steel rib of death. It's the only pottery tool I've cut myself on. I hates it, but even the red Mudtools ribs don't quite do the same job.
That can't really do a lot of damage, though. The bench grinder (used to shape and sharpen trim tools) could put an eye out if a grinding wheel shattered. (Stand to the side during startup, wear a face shield.)
If we include everything in the shop, my table saw is probably the most dangerous in terms of serious injury.
I don't think I'm all that dangerous. I used to work professionally in machine and tooling shops, and I have a lot of respect for stuff that can hurt me, both short term and long term. I have safety rituals for using power equipment, I always unplug power equipment immediately when I'm done with it. I wear safety glasses, face shields, know when not to wear gloves, etc. I make a living with my hands and eyes, and I put a great deal of value on them, and I practically treat tools like they're out to get me. (The worst injury I sustained in a machine shop was from the pop machine, which had lost it's catch basket years before... everyone knew you had to catch the glass bottle on the way out. And I did. And my reflexes tried to catch the second bottle that unexpectedly followed it... I reached it just as it hit the concrete.)