Elemental
If this is the only card in your hand, you can Special Summon it (from your hand). When this card is Summoned: You can draw 2 cards. You must control no other cards and have no cards in your hand to activate and to resolve this effect.
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--draw
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET + EFFECT_FLAG_ACTIVATE_CONDITION)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	local e4 = e2:Clone()
	e4:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
	c:RegisterEffect(e4)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	return Duel.GetFieldGroupCount(c:GetControler(), LOCATION_HAND, 0) == 1 and Duel.GetLocationCount(c:GetControler(), LOCATION_MZONE) > 0
end
function s.filter(c)
	return not c:IsStatus(STATUS_LEAVE_CONFIRMED)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return not Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD + LOCATION_HAND, 0, 1, e:GetHandler())
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsPlayerCanDraw(tp, 2)
	end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(2)
	Duel.SetOperationInfo(0, CATEGORY_DRAW, nil, 0, tp, 2)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	if Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD + LOCATION_HAND, 0, 1, e:GetHandler()) then
		return
	end
	local p, d = Duel.GetChainInfo(0, CHAININFO_TARGET_PLAYER, CHAININFO_TARGET_PARAM)
	Duel.Draw(p, d, REASON_EFFECT)
end


Elemental
If this is the only card in your hand, you can Special Summon it (from your hand). When this card is Summoned: You can draw 2 cards. You must control no other cards and have no cards in your hand to activate and to resolve this effect.
-- Elemental
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--draw
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET + EFFECT_FLAG_ACTIVATE_CONDITION)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	local e4 = e2:Clone()
	e4:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
	c:RegisterEffect(e4)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	return Duel.GetFieldGroupCount(c:GetControler(), LOCATION_HAND, 0) == 1 and Duel.GetLocationCount(c:GetControler(), LOCATION_MZONE) > 0
end
function s.filter(c)
	return not c:IsStatus(STATUS_LEAVE_CONFIRMED)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return not Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD + LOCATION_HAND, 0, 1, e:GetHandler())
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsPlayerCanDraw(tp, 2)
	end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(2)
	Duel.SetOperationInfo(0, CATEGORY_DRAW, nil, 0, tp, 2)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	if Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_ONFIELD + LOCATION_HAND, 0, 1, e:GetHandler()) then
		return
	end
	local p, d = Duel.GetChainInfo(0, CHAININFO_TARGET_PLAYER, CHAININFO_TARGET_PARAM)
	Duel.Draw(p, d, REASON_EFFECT)
end

