2 Level 3 monsters Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 "Wind-Up" monster from your hand or Deck. When a face-up "Wind-Up" monster on the field is destroyed and sent to your Graveyard (except during the Damage Step): You can detach 1 Xyz Material from this card to target that monster; return that target to the hand.
Uhm I still dont get it. You mean you want your opponent to summon it? or you actually want to use two level 3 to create a water type monster to summon cocytus? Or you mean windup deck with invoked engine?