LostKnightsRPG.org

Through a tear in the fabric of space a silver sword comes hurtling into the universe of autobots. A worthy mistress stumbles upon it and begins to wield its power.
In another part of autobot space the Matrix feels the pull of another power. It's current host allows the Matrix to guide him to the source, thus the two artifacts meet.
Both artifacts realize that this cartoon reality simply isn't big enough for the two of them. So the pair meet knowing only that two will stand and one shall fall.
Let the battle begin.

Before X Prime and the rest of the Autobots show up the Decepticons convince her that they are the good guys instead...
She beats on the autobots and nearly kills many till the leader X Prime pulls out the Matrix to "Light their Darkest Hour" and kills the woman leaving the sword impotent...

Winner - The Matrix of Leadership

pretty much. arguably castle greyskull itself might stand a chance... though i'm not sure of that either.