--深海の大ウナギ
function c13314457.initial_effect(c)
	--to grave
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(13314457,0))
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_TO_GRAVE)
	e1:SetCondition(c13314457.condition)
	e1:SetOperation(c13314457.operation)
	c:RegisterEffect(e1)
end
function c13314457.condition(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsPreviousLocation(LOCATION_ONFIELD)
end
function c13314457.filter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_WATER)
end
function c13314457.operation(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local g=Duel.GetMatchingGroup(c13314457.filter,tp,LOCATION_MZONE,0,nil)
	local tc=g:GetFirst()
	while tc do
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(500)
		e1:SetReset(RESET_EVENT+RESETS_STANDARD+RESET_PHASE+PHASE_END)
		tc:RegisterEffect(e1)
		tc=g:GetNext()
	end
end