XD I've actually read that before XD

Of course, Raigeki is no longer banned. :(

My only question is if its effect only activates once, then why not remove all three Materials?

And I don't see the effect as overpowered because it's Lightning Vortex in an Xyz Material. Or you can get a temp 2000 boost. Simple answer to that problem: Draining Shield, then nuke it next turn.