Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card gains 300 DEF for each Spell and Trap Card on the field. If an Insect-Type monster you control would be destroyed, you can destroy this card instead.
--砂漠の守護者
--Desert Protector
local s,id=GetID()
function s.initial_effect(c)
	--defup
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetCode(EFFECT_UPDATE_DEFENSE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetValue(s.val)
	c:RegisterEffect(e1)
	--destroy replace
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_DESTROY_REPLACE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTarget(s.destg)
	e2:SetValue(s.value)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
function s.val(e,c)
	return Duel.GetMatchingGroupCount(Card.IsSpellTrap,0,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)*300
end
function s.dfilter(c,tp)
	return c:IsLocation(LOCATION_MZONE) and c:IsFaceup() and c:IsRace(RACE_INSECT)
		and not c:IsReason(REASON_REPLACE) and c:IsControler(tp)
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return not eg:IsContains(e:GetHandler())
		and eg:IsExists(s.dfilter,1,nil,tp) end
	if Duel.SelectEffectYesNo(tp,e:GetHandler(),96) then
		return true
	else return false end
end
function s.value(e,c)
	return c:IsLocation(LOCATION_MZONE) and c:IsFaceup() and c:IsRace(RACE_INSECT)
		and not c:IsReason(REASON_REPLACE) and c:IsControler(e:GetHandlerPlayer())
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Destroy(e:GetHandler(),REASON_EFFECT|REASON_REPLACE)
end