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Machine Conversion Factory
Equip only to a Machine monster. It gains 300 ATK/DEF.

Machine Duplication
Target 1 Machine monster you control with 500 or less ATK; Special Summon up to 2 monsters from your Deck with the same name as that face-up monster.

Machine King
This card gains 100 ATK for each Machine-Type monster on the field.

Mad Dog of Darkness
He used to be a normal dog who played around in a park, but was corrupted by the powers of darkness.

Mad Sword Beast
If this card attacks a Defense Position monster, inflict piercing battle damage.

Mage Power
The equipped monster gains 500 ATK and DEF for each Spell/Trap Card you control.

Magical Ghost
This creature casts a spell of terror and confusion just before attacking its enemies.

Magical Hats
During your opponent's Battle Phase: Choose 2 Spell/Trap Cards from your Deck and 1 monster in your Main Monster Zone. Special Summon them as Normal Monsters (ATK 0/DEF 0) in face-down Defense Position, Set the chosen monster if it is face-up, and shuffle them on the field. The 2 cards chosen from your Deck are destroyed at the end of the Battle Phase, and cannot remain on the field except during this Battle Phase.

Magical Labyrinth
Equip only to "Labyrinth Wall". You can Tribute the equipped monster; Special Summon "Wall Shadow" from your Deck.

Magical Marionette
Each time a Spell Card is activated, place 1 Spell Counter on this card when that Spell Card resolves. This card gains 200 ATK for each Spell Counter on it. You can remove 2 Spell Counters from this card, then target 1 monster on the field; destroy that target.