Darkfall
When your opponent Special Summons 2 or more face-up monsters at the same time: Send those monsters to the Graveyard, then send all monsters in the opponent's hand and Deck to the Graveyard that have the same name as the monsters sent to the Graveyard by this effect.
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOGRAVE + CATEGORY_DECKDES)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c, sp, e)
	return c:IsFaceup() and c:IsSummonPlayer(sp) and (not e or c:IsRelateToEffect(e))
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return eg:IsExists(s.cfilter, 2, nil, 1 - tp)
	end
	local g = eg:Filter(s.cfilter, nil, 1 - tp)
	Duel.SetTargetCard(g)
	Duel.SetOperationInfo(0, CATEGORY_TOGRAVE, g, g:GetCount(), 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local g = Duel.GetChainInfo(0, CHAININFO_TARGET_CARDS):Filter(s.cfilter, nil, 1 - tp, e)
	Duel.SendtoGrave(g, REASON_EFFECT)
	local exg = Group.CreateGroup()
	local g1 = Duel.GetOperatedGroup()
	local tc = g1:GetFirst()
	while tc do
		if tc:IsLocation(LOCATION_GRAVE) then
			local fg = Duel.GetMatchingGroup(Card.IsCode, tp, 0, LOCATION_DECK + LOCATION_HAND, nil, tc:GetCode())
			exg:Merge(fg)
		end
		tc = g1:GetNext()
	end
	Duel.BreakEffect()
	Duel.SendtoGrave(exg, REASON_EFFECT)
end


Darkfall
When your opponent Special Summons 2 or more face-up monsters at the same time: Send those monsters to the Graveyard, then send all monsters in the opponent's hand and Deck to the Graveyard that have the same name as the monsters sent to the Graveyard by this effect.
-- Darkfall
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOGRAVE + CATEGORY_DECKDES)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c, sp, e)
	return c:IsFaceup() and c:IsSummonPlayer(sp) and (not e or c:IsRelateToEffect(e))
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return eg:IsExists(s.cfilter, 2, nil, 1 - tp)
	end
	local g = eg:Filter(s.cfilter, nil, 1 - tp)
	Duel.SetTargetCard(g)
	Duel.SetOperationInfo(0, CATEGORY_TOGRAVE, g, g:GetCount(), 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local g = Duel.GetChainInfo(0, CHAININFO_TARGET_CARDS):Filter(s.cfilter, nil, 1 - tp, e)
	Duel.SendtoGrave(g, REASON_EFFECT)
	local exg = Group.CreateGroup()
	local g1 = Duel.GetOperatedGroup()
	local tc = g1:GetFirst()
	while tc do
		if tc:IsLocation(LOCATION_GRAVE) then
			local fg = Duel.GetMatchingGroup(Card.IsCode, tp, 0, LOCATION_DECK + LOCATION_HAND, nil, tc:GetCode())
			exg:Merge(fg)
		end
		tc = g1:GetNext()
	end
	Duel.BreakEffect()
	Duel.SendtoGrave(exg, REASON_EFFECT)
end

