Um, I wouldn't say immortal, but, more like near halfway superhuman.
*looks at Klib*
I don't make anything float. My semblance is polarity, I can manipulate the magnetic field around metal objects.
*looks at Kuro*
And my semblance tends to be somewhat passive, like messing with compasses, and that pigeon that hit the window earlier was likely drawn to my magnetic field, so it's kind of like I activate it without even knowing, sometimes.