V qba'g guvax gung Uneel'f ntr vf eryrinag urer. Abobql qvfhchgrf Ibyqrzbeg'f qrngu jnf qhr gb uvf nggnpx ba Yvyl, Wnzrf, naq Uneel Cbggre; guhf, gur qrog jbhyq or gb gur Aboyr Ubhfr bs Cbggre, bs juvpu Uneel vf gur bayl yvivat zrzore. N qrog gb uvf Ubhfr jbhyq gurersber or n qrog gb uvz.

Most likely Transfiguring only your brain or a single organ would fall under partial Transfiguration, which presents the obvious challenge.