A video was recently posted by VintageVHS called Mad Libs Compilation 1. It’s an over 6 hour long compilation of full Mad Libs episodes, almost all of which have never been posted to RU-vid and they include the commercials.
I would've reworked the intro a bit: Charlie O'Donnell or Bob Hilton: And now, the game show where your imagination fills all the blanks, it's time to play "Mad Libs!" And now, here's the host of Mad Libs, David Sidoni!