This cultivar is a sport of H. 'Blue Mouse Ears' which was registered in 2010 by Danny Van Eechaute of Belgium. The slightly blue-green foliage has a medium blue-green colored marginal variegation. A slow growing, miniature size (5 inches high by 10 inches wide) hosta, it has leaves which are slightly cupped and broadly ovate to nearly round in shape. In July, it bears clusters of bell-shaped pale purple flowers.

Warren I. Pollock wrote comments about the many sports of H. 'Blue Mouse Ears' (which he termed BME) in The Hosta Journal (2012 Vol. 43 No. 2). He stated, "In 2010, Danny Van Eechaute registered 'Mystic Mouse'. Leaves have two shades of blue-green, with the leaf center being somewhat lighter than the margin."