--Cursilver Artefact of Demise
local s,id=GetID()
function s.initial_effect(c)
	--You can only control 1 "Cursilver Artifact of Demise".
	c:SetUniqueOnField(1,0,id)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--During the Main Phase: You can target 2 cards on the field, including a "Cursilver" monster you control; destroy them.
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetCountLimit(1,id)
	e2:SetHintTiming(0,TIMING_MAIN_END)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	--All monsters your opponent controls lose 100 ATK/DEF for each "Cursilver" card on the field and in the GYs.
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetRange(LOCATION_SZONE)
	e3:SetTargetRange(0,LOCATION_MZONE)
	e3:SetValue(s.atkval)
	c:RegisterEffect(e3)
	local e4=e3:Clone()
	e4:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e4)
end
function s.atkval(e,c)
	local LOCATIONS=LOCATION_GRAVE+LOCATION_MZONE+LOCATION_FZONE+LOCATION_SZONE
	return Duel.GetMatchingGroupCount(aux.FaceupFilter(Card.IsSetCard,0xc72),0,LOCATIONS,LOCATIONS,nil)*-100
end
function s.condition(e,tp)
	return Duel.IsMainPhase() and Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,0xc72),tp,LOCATION_MZONE,0,1,nil)
end
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(0xc72) and c:IsMonster()
		and Duel.IsExistingTarget(aux.TRUE,c:GetControler(),LOCATION_ONFIELD,LOCATION_ONFIELD,1,c)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return false end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g1=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g2=Duel.SelectTarget(tp,aux.TRUE,tp,0,LOCATION_ONFIELD,1,1,g1:GetFirst())
	g1:Merge(g2)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g1,#g1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetTargetCards(e)
	Duel.Destroy(g,REASON_EFFECT)
end