Send 1 "Neo-Spacian" monster and 1 "Elemental HERO" monster (1 from your hand and 1 from your Deck) to the GY; Special Summon 1 "Neo-Spacian" monster or 1 Level 5 or higher "Elemental HERO" monster from your Deck, and if you do, add 1 "Polymerization" from your Deck or GY to your hand. If you Special Summoned "Elemental HERO Neos" by this effect, it gains 1000 ATK. You cannot Special Summon monsters from the Extra Deck, except Fusion Monsters, the turn you activate this card. You can only activate 1 "EN - Engage Neo Space" per turn.
