Phoenix is a very good early game solution to GW. I started an account in late September of last year that started off using Phoenix in arena because they perform decently for the first few months and give you a two-for-one with the Thrawn and Palpatine events. Phoenix has the advantage of being really excellent GW performers because of their high survivability and protection and health regen. Since I kept them reasonably geared relative to the rest of my roster, they were able to support my GW efforts until I could sim them (actually, I only ran into one I couldn't complete in those five months - so well worth it).