Synchro
If a Synchro Monster is on the field: Draw 1 card, then, if 3 or more Synchro Monsters are on the field, you can draw 1 more card. You can only activate 1 "Synchro Creed" per turn.
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsType(TYPE_SYNCHRO) and c:IsFaceup()
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, nil)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsPlayerCanDraw(tp, 1)
	end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0, CATEGORY_DRAW, nil, 0, tp, 1)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local p, d = Duel.GetChainInfo(0, CHAININFO_TARGET_PLAYER, CHAININFO_TARGET_PARAM)
	if
		Duel.Draw(p, d, REASON_EFFECT) > 0
		and Duel.IsPlayerCanDraw(p, 1)
		and Duel.GetMatchingGroupCount(s.filter, p, LOCATION_MZONE, LOCATION_MZONE, nil) >= 3
		and Duel.SelectYesNo(p, aux.Stringid(id, 0))
	then
		Duel.BreakEffect()
		Duel.Draw(p, 1, REASON_EFFECT)
	end
end


Synchro
If a Synchro Monster is on the field: Draw 1 card, then, if 3 or more Synchro Monsters are on the field, you can draw 1 more card. You can only activate 1 "Synchro Creed" per turn.
-- Synchro
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsType(TYPE_SYNCHRO) and c:IsFaceup()
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_MZONE, LOCATION_MZONE, 1, nil)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsPlayerCanDraw(tp, 1)
	end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0, CATEGORY_DRAW, nil, 0, tp, 1)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local p, d = Duel.GetChainInfo(0, CHAININFO_TARGET_PLAYER, CHAININFO_TARGET_PARAM)
	if
		Duel.Draw(p, d, REASON_EFFECT) > 0
		and Duel.IsPlayerCanDraw(p, 1)
		and Duel.GetMatchingGroupCount(s.filter, p, LOCATION_MZONE, LOCATION_MZONE, nil) >= 3
		and Duel.SelectYesNo(p, aux.Stringid(id, 0))
	then
		Duel.BreakEffect()
		Duel.Draw(p, 1, REASON_EFFECT)
	end
end

