Bluish Flame Liberator, Prominence & Liberator of Oath, Aglovale was introduced in Cardfight Vanguard Animated Series in Episode 184. First, when I saw his skill, I already seen that the deck will need to be focused on both of them, Either 4 copies of Bluish Flame Liberator, Prominence & Liberator of Oath, Aglovale or you will probably miss his Legion skill. However, each time each turn, you will still able to Superior a unit from your top deck by only CB 1 and retiring one.
Which makes this card very powerful with supporting rear-guard such as May Rain Liberator, Bruno & Coronagal Liberator. This skill is also shown in the preview when Gailard performs Legion with Bluish Flame Liberator, Prominence.
By the way, thanks for the early credit Gailard. The Final Turn with this card is not promising, however Critical 2 and Legion attack will always be dangerous to the opponent unless there is Sentinel Guard in your opponent's hand. However when this card is in Legion, this card card works very well with Liberator of Oath, Aglovale himself, Catchgal Liberator (Stand), and Physical Force Liberator, Zorron. Plus late game will always be dangerous if this card is supported by Bruno and Coronagal.