Valerifawn,
You can discard 1 card, then target 1 Level 2 or lower Beast monster in your GY, except "Valerifawn, Mystical Beast of the Forest"; Special Summon it in Attack Position or face-down Defense Position. You can only use this effect of "Valerifawn, Mystical Beast of the Forest" 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:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1, id)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
function s.spcost(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(Card.IsDiscardable, tp, LOCATION_HAND, 0, 1, nil)
	end
	Duel.DiscardHand(tp, Card.IsDiscardable, 1, 1, REASON_COST + REASON_DISCARD)
end
function s.filter(c, e, tp)
	return c:IsLevelBelow(2) and c:IsRace(RACE_BEAST) and not c:IsCode(id) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false, POS_FACEUP_ATTACK + POS_FACEDOWN_DEFENSE)
end
function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	if chkc then
		return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc, e, tp)
	end
	if chk == 0 then
		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingTarget(s.filter, tp, LOCATION_GRAVE, 0, 1, nil, e, tp)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_GRAVE, 0, 1, 1, nil, e, tp)
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, g, 1, 0, 0)
end
function s.spop(e, tp, eg, ep, ev, re, r, rp)
	if Duel.GetLocationCount(tp, LOCATION_MZONE) <= 0 then
		return
	end
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.SpecialSummon(tc, 0, tp, tp, false, false, POS_FACEUP_ATTACK + POS_FACEDOWN_DEFENSE) > 0 and tc:IsFacedown() then
		Duel.ConfirmCards(1 - tp, tc)
	end
end


Valerifawn,
You can discard 1 card, then target 1 Level 2 or lower Beast monster in your GY, except "Valerifawn, Mystical Beast of the Forest"; Special Summon it in Attack Position or face-down Defense Position. You can only use this effect of "Valerifawn, Mystical Beast of the Forest" once per turn.
-- Valerifawn,
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id, 0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1, id)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
function s.spcost(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(Card.IsDiscardable, tp, LOCATION_HAND, 0, 1, nil)
	end
	Duel.DiscardHand(tp, Card.IsDiscardable, 1, 1, REASON_COST + REASON_DISCARD)
end
function s.filter(c, e, tp)
	return c:IsLevelBelow(2) and c:IsRace(RACE_BEAST) and not c:IsCode(id) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false, POS_FACEUP_ATTACK + POS_FACEDOWN_DEFENSE)
end
function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	if chkc then
		return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc, e, tp)
	end
	if chk == 0 then
		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingTarget(s.filter, tp, LOCATION_GRAVE, 0, 1, nil, e, tp)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_GRAVE, 0, 1, 1, nil, e, tp)
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, g, 1, 0, 0)
end
function s.spop(e, tp, eg, ep, ev, re, r, rp)
	if Duel.GetLocationCount(tp, LOCATION_MZONE) <= 0 then
		return
	end
	local tc = Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.SpecialSummon(tc, 0, tp, tp, false, false, POS_FACEUP_ATTACK + POS_FACEDOWN_DEFENSE) > 0 and tc:IsFacedown() then
		Duel.ConfirmCards(1 - tp, tc)
	end
end

