Activate this Skill during your Main Phase. All Machine monsters you control are unaffected by your opponent's Spell effects. You can Normal Summon Machine Normal Monsters with 1 less Tribute. If a non-Machine monster is in your GY, flip this Skill over. This Skill can only be used once per Duel.
![Spell Proof Armor [SBSC-ENS02] Super Rare](http://www.cardmerchanttakapuna.co.nz/cdn/shop/products/476a5e25-c863-567d-9d20-015af3c23790.png?v=1698532878&width=1445)