Equip only to a Fusion Monster that lists "Elemental HERO Neos" as a Fusion Material Monster. It does not have to activate its effect during the End Phase to shuffle itself into the Extra Deck. If the equipped monster leaves the field: You can Special Summon 1 "Elemental HERO Neos" from your hand, Deck, or Graveyard.
How to Get
Makes mandatory effects optional / Prevents returning cards from field to Deck
Prevents activation of Effect Monsters
Special Summons from your hand / Special Summons from your Deck / Special Summons from your Graveyard