Batman Mafia - MAFIA Wins.

There's no rule against saying he got info from Tobi that he really didn't.

This. I've already proposed multiple ways to incriminate mafia through PMs without it actually being against the rules. It's a very harsh gambit, but it works a lot of the time. Still waiting to see what Corn's going to turn up with.

Maybe he can double vote, give someone's vote double value, or forgot the RNG part.

EDIT: Also, about the "possibly valid" strategy, corn already blew it by saying he got a PM, which goes against the rules, so he has to either confess being mason/mafia or confess that he (actually, the one who sent the PM) broke the rules.
Either way, if he actually received an unauthorized PM he shouldn't use that information for some "game changing" info he's been announcing.

Stop rolefishing.