If you control a "Ghostrick" Field Spell or a "Ghostrick" Link Monster: You can target 1 face-up monster your opponent controls; your opponent can pay 2000 LP to make this card's effect "Set this card instead of sending it to the GY after activation", otherwise, for the rest of this turn, that face-up monster cannot attack, its effects are negated, also it is changed to face-down Defense Position during the End Phase. You can only activate 1 "Ghostrick or Treat" per turn.