The Energon Pub

I don't really feel like rewatching all my G1 Transformers cartoons (well, I do, but I don't have the time right now^^) but I'd like to know just how many times have Megatron tried to conquer earth, destroy the Autobots/humanity by using different kinds of "deathrays"?
By "deathray" I mean just about every form of energy weapon he's built/tried to steal.

I know about the big mobile tank tht he tricked Red Alert into stealing for him.
And the energy weapon that he used to get the Autobots locked in vehicle modes.
and the Energy gun on top of the pyramid "Fire on the mountain"
And i think he had one as well in B.O.T. (not sure though)

But I have the feeling that he's tried it more than this, so I'd like to know exactly how many times he's tried (and failed9 with "Ultimate Deathrays™"