6eeba363_onsters___Yu_Gi_Oh__Card_Guide__Card_Text
[Card Name] Darkness Neosphere [Type] Effect Monster [Attribute] DARK [Sub Type] Fiend [ATK] 4000 [DEF] 4000 [Card Text] 
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by sending 1 Fiend-Type monster you control and 1 Fiend-Type monster from your hand to the Graveyard when your opponent's monster declares an attack. This card cannot be destroyed by battle. Once per turn, you can return all face-up Trap Cards you control to the hand.
Yu-Gi-Oh! Level 10 Monsters - Yu-Gi-Oh! Card Guide