Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Tuner + 1+ non-Tuner monsters If this card is Special Summoned: You can change all face-up monsters your opponent controls to face-down Defense Position. Illusion and Spellcaster Synchro Monsters you control gain 500 ATK, also if they attack a Defense Position monster, inflict double piercing battle damage to your opponent.
--白き森の魔狼シルウィア
--Silvera, Wolf Tamer of the White Forest
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--1 Tuner + 1+ non-Tuner monsters
	Synchro.AddProcedure(c,nil,1,1,Synchro.NonTuner(nil),1,99)
	--Flip all opponent monsters face-down
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetTarget(s.postg)
	e1:SetOperation(s.posop)
	c:RegisterEffect(e1)
	--Illusion and Spellcaster Synchro Monsters gain 500 ATK
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetTarget(function(e,c) return c:IsRace(RACE_ILLUSION|RACE_SPELLCASTER) and c:IsType(TYPE_SYNCHRO) end)
	e2:SetValue(500)
	c:RegisterEffect(e2)
	--Illusion and Spellcaster Synchro Monsters inflict double piercing damage
	local e3=e2:Clone()
	e3:SetCode(EFFECT_PIERCE)
	e3:SetValue(DOUBLE_DAMAGE)
	c:RegisterEffect(e3)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,nil)
	if #g>0 then
		Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)
	end
end