He's using the magic he knows. He's believing.

Honestly, I wouldn't be mad if we got a The Magicks of Megas-tu prequel even if it breaks a bunch of canon and they use a convenient memory wipe to solve all the problems, mostly because it would involve TAS getting any canon recognition whatsoever.

Maybe it's one of the Calamarain, like the one Q summoned onto his palm in Deja Q

Pondering his orb.

Making the CGI team work for their money

Clearly a hadouken.

I believe he's channeling his ki to charge a kamehameha.

He's probably manifesting Picard through his own and Sarek's shared Katra. Like a Katra ghost... Because that's the sort of dumb shit the SNW writers will make up on the spot for no good reason.

He uses magnetic fields to trap his blue angels. He was hilarious at parties when younger.