User blog comment:Mohamed7845/Vargas/Selena/Lance/Eze/Atro/Magress 7* forms Who is Better/@comment-26972160-20150909113044/@comment-112.210.123.133-20150914160445

^ That's not exactly the reason why Selena is really great in arena, it's her inherent ability to use angel-idol when near death. Even if Atro does manage to get his BB up pretty fast, he has higher chances of dying during the enemies counter attack.