Choose 1 opponent's unused Main Monster Zones; if your opponent would Normal Summon/Set or Special Summon a monster to their Main Monster Zone, and the chosen zone can be used, they must use that...
Activate 1 of these effects, also, after that, Set this card face-down instead of sending it to the GY.
E Send 1 monster from your hand or face-up field to the GY, and if you do, add 1 Flip monster...
FLIP: You can send 1 Fiend monster from your Deck to the GY.
If this card is sent from the hand or Deck to the GY: You can Special Summon this card in face-down Defense Position. You can only use...