Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control 2 or more Attack Position Spellcaster monsters: Target 1 of them; its ATK becomes 3000 until the end of this turn, also for the rest of this turn after this card resolves, other Spellcaster monsters you control cannot attack.
--マジシャンズ・クロス
--Magicians Unite
local s,id=GetID()
function s.initial_effect(c)
	--atkup
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsPosition(POS_FACEUP_ATTACK) and c:IsRace(RACE_SPELLCASTER)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_MZONE,0,2,nil)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_ATTACK)
	e1:SetProperty(EFFECT_FLAG_OATH+EFFECT_FLAG_IGNORE_IMMUNE)
	e1:SetTargetRange(LOCATION_MZONE,0)
	e1:SetTarget(s.ftarget)
	e1:SetLabel(g:GetFirst():GetFieldID())
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(3000)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end
function s.ftarget(e,c)
	return e:GetLabel()~=c:GetFieldID() and c:IsRace(RACE_SPELLCASTER)
end