Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Destroy all monsters you control, and if you do, inflict 300 damage to your opponent for each monster destroyed.
--サンダー・クラッシュ
--Thunder Crash
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY+CATEGORY_DAMAGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.TRUE,tp,LOCATION_MZONE,0,1,nil) end
	local g=Duel.GetMatchingGroup(aux.TRUE,tp,LOCATION_MZONE,0,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,#g*300)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(aux.TRUE,tp,LOCATION_MZONE,0,nil)
	local ct=Duel.Destroy(g,REASON_EFFECT)
	Duel.Damage(1-tp,ct*300,REASON_EFFECT)
end