Decided to jump to the other end of the list, and draw World. Probably the trickiest of the bunch to assign anyone to, but in the end I decided upon Star Swirl. I wanted at least a few more stallions in this deck and Star Swirl has seemed to me, at the same time one who has accomplished a great deal of things, as fits the World. If the other meanings fit, I am somewhat on the fence about, but I did need to assign someone into this card.
 
Tarot card meanings:  
Upright: Completion, integration, accomplishment, travel  
Reversed: Seeking personal closure, short-cuts, delays