Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can discard 1 card to target 1 face-up monster on the field; place an Ice Counter on that target. This card gains 300 ATK for each Ice Counter on the field.
--コールド・エンチャンター
--Cold Enchanter
local s,id=GetID()
function s.initial_effect(c)
	--add counter
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_COUNTER)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
	--gain ATK
	local e2=Effect.CreateEffect(c)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetValue(s.atkval)
	c:RegisterEffect(e2)
end
s.counter_list={0x1015}
function s.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 s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsCanAddCounter(0x1015,1) end
	if chk==0 then return Duel.IsExistingTarget(Card.IsCanAddCounter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil,0x1015,1) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,Card.IsCanAddCounter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil,0x1015,1)
	Duel.SetOperationInfo(0,CATEGORY_COUNTER,nil,1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and tc:IsCanAddCounter(0x1015,1) then
		tc:AddCounter(0x1015,1)
	end
end
function s.atkval(e,c)
	return Duel.GetCounter(0,1,1,0x1015)*300
end