Lurrus

Lurrus of the Dream-Den is a female cat nightmare from the plane of Ikoria.

Lurrus makes its den in the Indatha lowlands. The planeswalker Vivien Reid stumbled upon its lair while exploring, and found in it a litter of adorable nightmare kittens. Lurrus apparently has the ability to appear and disappear at will, because when Vivien tried to take a closer look at the kittens, Lurrus appeared from a wisp of smoke. Vivien quickly made her exit.