The Clash of Quatre Knights : Gaillard VS Serra

In this fight, you will see Gaillard defeat Serra by using Bluish Flame Liberator, Prominence Glare while Serra used Star-vader, Dark Zodiac and Star-vader, Venom Dancer. 
Rulings for Star-vader, Venom Dancer

From the second skill, by Counter Blast (1) with Star-vader in its card name, if you have another unit in the center column, you may lock one of your opponent rear-guards in the back row. This skill is an ACT which means you can active it more than once in a turn. 

The main trick for this card is its Legion skill, where by Counter Blast (1) only at the end of battle that this unit attacked a Vanguard and in Legion, you can choose up to one rear-guards for each locked cards your opponent have. Thats mean if your opponent have three locked unit at the end of battle that this unit attacked a Vanguard and in Legion, you can Stand three of your rear-guards.

This Legion skill be useful if team up with the starter Star-vader, Robin Knight. you can easily lock three of your opponent's rear-guards in a second by only pay Counter Blast (2).