This is how Black Phantom reveals himself goes in Princess Twilight Sparkle Part 1.
[Twilight and Optimus train]
[The Arachnix drones appear]
Twilight Sparkle: Who are you?
Black Phantom: I am Black Phantom. This is my pet, Arachnix. And with these Plunder Vines, nothing will stand in my way in getting to the Tree of Harmony.
Twilight Sparkle: For what?
Black Phantom: For it's magic, of course.
Twilight Sparkle: Never. The magic will recognize you're a villain.
Black Phantom: I've already got a solution for that.
[Black Phantom clicks his fingers and Voltix steps out]
Black Phantom: Now will you give me the Elements or will I have Voltix just rip them from you?
Twilight Sparkle: I don't know.
Black Phantom: Hmm, there seems to be a relation between these six. [to Voltix] Voltix, start with the lavender one.
Voltix: It'll be a pleasure, boss. [to Twilight] This will teach you to mess with villains like Black Phantom.
[Voltix uses his Lightning Whip to take the Element of Magic]