There are a few localities of Marcgravia that posess white leaf edges.  Out of the three I’ve seen, this is the brightest green, and the earliest to display the white leaf edging (the other two only display it on more established growth).  The leaves for me have stayed less than 1″, but like many Marcgravia, could get larger outside a terrarium.  It is a slower growing species.

Available plants are well-rooted in 2″ pots. They will be shipped potted. The last photo is representative of the size plant you will receive.