--スネーク・レイン
function c17189677.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOGRAVE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCost(c17189677.cost)
	e1:SetTarget(c17189677.target)
	e1:SetOperation(c17189677.activate)
	c:RegisterEffect(e1)
end
function c17189677.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,e:GetHandler()) end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST+REASON_DISCARD)
end
function c17189677.tgfilter(c)
	return c:IsRace(RACE_REPTILE) and c:IsType(TYPE_MONSTER) and c:IsAbleToGrave()
end
function c17189677.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(c17189677.tgfilter,tp,LOCATION_DECK,0,4,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,4,tp,LOCATION_DECK)
end
function c17189677.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(c17189677.tgfilter,tp,LOCATION_DECK,0,nil)
	if g:GetCount()>=4 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
		local sg=g:Select(tp,4,4,nil)
		Duel.SendtoGrave(sg,REASON_EFFECT)
	end
end