Double-Headed
If you control no monsters, you can Special Summon this card (from your hand). You can only Special Summon "Double-Headed Dino King Rex" once per turn this way. If this card is Normal or Special Summoned: You can target 1 monster on the field with less ATK than the total ATK of all Dinosaur monsters you control; destroy it. You can only use this effect of "Double-Headed Dino King Rex" once per turn.
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id, 0))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--destroy
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET + EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCountLimit(1, id + o)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.GetFieldGroupCount(tp, LOCATION_MZONE, 0) == 0
end
function s.atkfilter(c)
	return c:IsFaceup() and c:IsRace(RACE_DINOSAUR)
end
function s.filter(c, atk)
	return c:IsFaceup() and c:GetAttack() < atk
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	local atk = Duel.GetMatchingGroup(s.atkfilter, tp, LOCATION_MZONE, 0, nil):GetSum(Card.GetAttack)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and s.filter(chkc, atk)
	end
	if chk == 0 then
		return atk > 0 and Duel.IsExistingTarget(s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, nil, atk)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_DESTROY)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, 1, nil, atk)
	Duel.SetOperationInfo(0, CATEGORY_DESTROY, g, #g, 0, 0)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Destroy(tc, REASON_EFFECT)
	end
end


Double-Headed
If you control no monsters, you can Special Summon this card (from your hand). You can only Special Summon "Double-Headed Dino King Rex" once per turn this way. If this card is Normal or Special Summoned: You can target 1 monster on the field with less ATK than the total ATK of all Dinosaur monsters you control; destroy it. You can only use this effect of "Double-Headed Dino King Rex" once per turn.
-- Double-Headed
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id, 0))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--destroy
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET + EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCountLimit(1, id + o)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.GetFieldGroupCount(tp, LOCATION_MZONE, 0) == 0
end
function s.atkfilter(c)
	return c:IsFaceup() and c:IsRace(RACE_DINOSAUR)
end
function s.filter(c, atk)
	return c:IsFaceup() and c:GetAttack() < atk
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	local atk = Duel.GetMatchingGroup(s.atkfilter, tp, LOCATION_MZONE, 0, nil):GetSum(Card.GetAttack)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and s.filter(chkc, atk)
	end
	if chk == 0 then
		return atk > 0 and Duel.IsExistingTarget(s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, nil, atk)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_DESTROY)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, 1, nil, atk)
	Duel.SetOperationInfo(0, CATEGORY_DESTROY, g, #g, 0, 0)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Destroy(tc, REASON_EFFECT)
	end
end

