Elemental HERO Spirit of Neos (MP23-EN117) - 25th Anniversary Tin: Dueling Heroes Mega Pack 1st Edition

When an opponent's monster declares an attack: You can Special Summon this card from your hand in Defense Position, and if you do, it cannot be destroyed by battle. If this card is Special Summoned: You can add from your Deck to your hand 1 "Polymerization" or 1 Spell/Trap that mentions an "Elemental HERO" monster's card name. During your Main Phase: You can shuffle this card into the Deck, and if you do, Special Summon 1 "Elemental HERO" Normal Monster from your Deck. You can only use each effect of "Elemental HERO Spirit of Neos" once per turn.