Ego draconis [sum], yeah :p Latin doesn't like redondancy(?), so there is a choice between "ego" and "sum" to make. Yet, "Ego Draconis" is a great title in a phonetic point of view
Redundancy Which - as you point out - means either "ego" or "sum" is interchangable and in this case, I'm certain "ego" sounds best.
I am in blood Stepp'd in so far, that, should I wade no more, Returning were as tedious as go o'er.
Which - as you point out - means either "ego" or "sum" is interchangable and in this case, I'm certain "ego" sounds best. 
