That Selena looks gorgeous! Are you sure you want to level him up instead of maxing daria? She's so far ahead already. You could concentrate on Onyx Sentinel instead. Today I finished maxing mine. I had 19 bcx from rewards, while the rest were purchased since they've been much cheaper.
PS: If you want to participate, please tag someone else, tell us what rule set you'd use him on the most and write down the account where you want to receive in case you win.