--エーテル・シーカー
--Ether Seeker
local s,id=GetID()
function s.initial_effect(c)
	--ATK Change
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.costfilter(c)
	return c:IsSpellTrap() and c:IsAbleToGraveAsCost()
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.costfilter,tp,LOCATION_HAND,0,1,nil) end
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.FilterMaximumSideFunctionEx(Card.IsFaceup),tp,0,LOCATION_MZONE,1,e:GetHandler()) end
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	--Requirement
	local c=e:GetHandler()
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.costfilter,tp,LOCATION_HAND,0,1,1,nil)
	if Duel.SendtoGrave(g,REASON_COST)==0 then return end
	--Effect
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectMatchingCard(tp,aux.FilterMaximumSideFunctionEx(Card.IsFaceup),tp,0,LOCATION_MZONE,1,1,nil)
	if #g>0 then
		Duel.HintSelection(g)
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-300)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		g:GetFirst():RegisterEffect(e1)
		if Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsCode,CARD_FUSION),tp,LOCATION_GRAVE,0,1,nil)
			and Duel.IsExistingMatchingCard(Card.IsSpellTrap,tp,0,LOCATION_ONFIELD,1,nil)
			and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
			local g=Duel.SelectMatchingCard(tp,Card.IsSpellTrap,tp,0,LOCATION_ONFIELD,1,1,nil)
			Duel.HintSelection(g)
			Duel.BreakEffect()
			Duel.Destroy(g,REASON_EFFECT)
		end
	end
end