"M" stands for "Magnet", as its text mentions that he uses magnetism. Not related with Yugi's magnet warriors though.
Why GameA suggests that this card has a connection with Guardian archetype?
Skull Guardian, in older games where Ritual materials are extremely specific, requires M-Warrior #1 as one of the monsters Tributed to Ritual Summon Skull Guardian.
Forbidden Memories maybe?
Well, it's not a bad correlation if you think that Skull Guardian have all these steel armor attached to his body while M-Warriors are using magnetism.
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