Alien
If a Reptile monster you control is destroyed by battle with an opponent's attacking monster and sent to the GY: Take control of the opponent's monster, and if you do, it becomes a Reptile.
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_CONTROL)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_BATTLE_DESTROYED)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	local ec = eg:GetFirst()
	return eg:GetCount() == 1
		and ec:IsPreviousControler(tp)
		and ec:IsRace(RACE_REPTILE)
		and bit.band(ec:GetPreviousRaceOnField(), RACE_REPTILE) ~= 0
		and ec == Duel.GetAttackTarget()
		and ec:IsLocation(LOCATION_GRAVE)
		and ec:IsReason(REASON_BATTLE)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	local tc = eg:GetFirst():GetReasonCard()
	if chk == 0 then
		return tc:IsControler(1 - tp) and tc:IsRelateToBattle() and tc:IsControlerCanBeChanged()
	end
	Duel.SetTargetCard(tc)
	Duel.SetOperationInfo(0, CATEGORY_CONTROL, tc, 1, 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		if Duel.GetControl(tc, tp) ~= 0 then
			local e1 = Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_CHANGE_RACE)
			e1:SetValue(RACE_REPTILE)
			e1:SetReset(RESET_EVENT + RESETS_STANDARD)
			tc:RegisterEffect(e1)
		end
	end
end


Alien
If a Reptile monster you control is destroyed by battle with an opponent's attacking monster and sent to the GY: Take control of the opponent's monster, and if you do, it becomes a Reptile.
-- Alien
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_CONTROL)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_BATTLE_DESTROYED)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	local ec = eg:GetFirst()
	return eg:GetCount() == 1
		and ec:IsPreviousControler(tp)
		and ec:IsRace(RACE_REPTILE)
		and bit.band(ec:GetPreviousRaceOnField(), RACE_REPTILE) ~= 0
		and ec == Duel.GetAttackTarget()
		and ec:IsLocation(LOCATION_GRAVE)
		and ec:IsReason(REASON_BATTLE)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	local tc = eg:GetFirst():GetReasonCard()
	if chk == 0 then
		return tc:IsControler(1 - tp) and tc:IsRelateToBattle() and tc:IsControlerCanBeChanged()
	end
	Duel.SetTargetCard(tc)
	Duel.SetOperationInfo(0, CATEGORY_CONTROL, tc, 1, 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		if Duel.GetControl(tc, tp) ~= 0 then
			local e1 = Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_CHANGE_RACE)
			e1:SetValue(RACE_REPTILE)
			e1:SetReset(RESET_EVENT + RESETS_STANDARD)
			tc:RegisterEffect(e1)
		end
	end
end

