Skill activationFlip this card over when you activate this Skill.EffectActivate this Skill during your Main Phase and apply the following: ● Machine Normal Monsters you control are unaffected by your opponent's Spell Cards or effects. ● While you control no monsters, you can Normal Summon Machine Normal Monsters with 1 less Tribute.If you have a non-Machine monster on your field or GY, flip this card over. This Skill can only be used once per Duel.