Hi!
I was thinking that 3x Eldar Refugees are good alternative to any combination of Rogue Trader and Void Pirate. One Refugee costs and does the same as Rogue Trader and Void Pirate combined, being one card less. This means that it's easier to move it between the planets (with Mobility card) or to your hand (with Craftworld Portal card). Besides this spares you place for three cards.
My deck is work in progress so I'm going to post here from time to time. What do you think of Eldar?