"Arcana Force EX - The Light Ruler" and "Arcana Force EX - The Dark Ruler" are the only "Arcana Force" monsters that are not based on tarot cards. They are also the only "Arcana Force" monsters that have a positive effect regardless of the result of the coin toss.
This card does have a symbolic meaning despite not being based on a real Tarot Card. It represents Sartorius after he is fully consumed by The Light of Destruction, hence its name "The Light Ruler".
In the anime, it is revealed that the Ex stands for "Extra".
This card was the first "Arcana Force" monster to be released in the OCG, but the last to be released in the TCG. It shares this trait with "Meklord Emperor Wisel", the first "Meklord Emperor" released in the OCG and the last to be released for the TCG.
In older prints of this card, the name is not capitalized the same way as its counterpart, since the X in "EX" and the T in "The" are lower case on this card but capitalized on the other. However, both the Dark Ruler and this card now have the X in "EX" capitalized and the T in "The" capitalized in newer prints of these cards and in some video games, if you look at this card, the T in "The" and the X in "EX" are capitalized.