Nerva
3 "Artmage" monsters
Must first be either Fusion Summoned, or Special Summoned (from your Extra Deck) in Defense Position by Tributing 3 monsters with different Types. You can only Special Summon "Nerva the Power Patron of Creation(s)" once per turn. While a card is in the Field Zone, this card cannot be destroyed by card effects. Once per turn, when you activate an "Artmage" monster's effect (Quick Effect): You can make the activated effect become "Destroy all cards your opponent controls".
local SETCARD_ID_0 = 0x1cd --Artmage

local SETCARD_ID_0 = 0x1cd --Artmage
local s, id, o = GetID()
function s.initial_effect(c)
	c:SetSPSummonOnce(id)
	aux.AddFusionProcFunRep(c, s.ffilter, 3, true)
	c:EnableReviveLimit()
	--special summon condition
	local e0 = Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_SINGLE)
	e0:SetProperty(EFFECT_FLAG_SINGLE_RANGE + EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE)
	e0:SetCode(EFFECT_SPSUMMON_CONDITION)
	e0:SetRange(LOCATION_EXTRA)
	e0:SetValue(aux.fuslimit)
	c:RegisterEffect(e0)
	--spsummon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE + EFFECT_FLAG_SPSUM_PARAM)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetTargetRange(POS_FACEUP_DEFENSE, 0)
	e1:SetRange(LOCATION_EXTRA)
	e1:SetCondition(s.hspcon)
	e1:SetTarget(s.hsptg)
	e1:SetOperation(s.hspop)
	c:RegisterEffect(e1)
	--indestructable
	local e2 = Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.indcon)
	e2:SetValue(1)
	c:RegisterEffect(e2)
	--change effect
	local e3 = Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id, 0))
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_CHAINING)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetCondition(s.chcon)
	e3:SetTarget(s.chtg)
	e3:SetOperation(s.chop)
	c:RegisterEffect(e3)
end
function s.ffilter(c)
	return c:IsFusionSetCard(SETCARD_ID_0)
end
function s.hspfilter(c, tp, sc)
	return c:IsControler(tp) and c:IsReleasable(REASON_SPSUMMON) and c:IsCanBeFusionMaterial(sc, SUMMON_TYPE_SPECIAL)
end
function s.hspchk(g, tp, sc)
	return Duel.GetLocationCountFromEx(tp, tp, g, sc) > 0 and g:GetClassCount(Card.GetRace) == #g
end
function s.hspcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	local rg = Duel.GetMatchingGroup(s.hspfilter, tp, LOCATION_MZONE, 0, nil, tp, e:GetHandler())
	return rg:CheckSubGroup(s.hspchk, 3, 3, tp, e:GetHandler())
end
function s.hsptg(e, tp, eg, ep, ev, re, r, rp, chk, c)
	local rg = Duel.GetMatchingGroup(s.hspfilter, tp, LOCATION_MZONE, 0, nil, tp, e:GetHandler())
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_RELEASE)
	local sg = rg:SelectSubGroup(tp, s.hspchk, true, 3, 3, tp, e:GetHandler())
	if sg then
		sg:KeepAlive()
		e:SetLabelObject(sg)
		return true
	else
		return false
	end
end
function s.hspop(e, tp, eg, ep, ev, re, r, rp, c)
	local g = e:GetLabelObject()
	Duel.Release(g, REASON_SPSUMMON)
	g:DeleteGroup()
end
function s.indcon(e)
	return Duel.IsExistingMatchingCard(aux.TRUE, e:GetHandlerPlayer(), LOCATION_FZONE, LOCATION_FZONE, 1, nil)
end
function s.chcon(e, tp, eg, ep, ev, re, r, rp)
	local ec = re:GetHandler()
	local b1 = re:GetHandler():IsRelateToEffect(re) and ec:IsSetCard(SETCARD_ID_0)
	local b2 = re:GetActivateLocation() == LOCATION_MZONE and not ec:IsLocation(LOCATION_MZONE) and ec:IsPreviousSetCard(SETCARD_ID_0)
	return rp == tp and re:IsActiveType(TYPE_MONSTER) and (b1 or b2)
end
function s.chtg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(aux.TRUE, rp, 0, LOCATION_ONFIELD, 1, nil)
	end
end
function s.chop(e, tp, eg, ep, ev, re, r, rp)
	local g = Group.CreateGroup()
	Duel.ChangeTargetCard(ev, g)
	Duel.ChangeChainOperation(ev, s.repop)
end
function s.repop(e, tp, eg, ep, ev, re, r, rp)
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_ONFIELD, nil)
	Duel.Destroy(sg, REASON_EFFECT)
end


Nerva
3 "Artmage" monsters
Must first be either Fusion Summoned, or Special Summoned (from your Extra Deck) in Defense Position by Tributing 3 monsters with different Types. You can only Special Summon "Nerva the Power Patron of Creation(s)" once per turn. While a card is in the Field Zone, this card cannot be destroyed by card effects. Once per turn, when you activate an "Artmage" monster's effect (Quick Effect): You can make the activated effect become "Destroy all cards your opponent controls".
-- Nerva
local SETCARD_ID_0 = 0x1cd --Artmage
local s, id, o = GetID()
function s.initial_effect(c)
	c:SetSPSummonOnce(id)
	aux.AddFusionProcFunRep(c, s.ffilter, 3, true)
	c:EnableReviveLimit()
	--special summon condition
	local e0 = Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_SINGLE)
	e0:SetProperty(EFFECT_FLAG_SINGLE_RANGE + EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE)
	e0:SetCode(EFFECT_SPSUMMON_CONDITION)
	e0:SetRange(LOCATION_EXTRA)
	e0:SetValue(aux.fuslimit)
	c:RegisterEffect(e0)
	--spsummon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE + EFFECT_FLAG_UNCOPYABLE + EFFECT_FLAG_SPSUM_PARAM)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetTargetRange(POS_FACEUP_DEFENSE, 0)
	e1:SetRange(LOCATION_EXTRA)
	e1:SetCondition(s.hspcon)
	e1:SetTarget(s.hsptg)
	e1:SetOperation(s.hspop)
	c:RegisterEffect(e1)
	--indestructable
	local e2 = Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.indcon)
	e2:SetValue(1)
	c:RegisterEffect(e2)
	--change effect
	local e3 = Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id, 0))
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_CHAINING)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetCondition(s.chcon)
	e3:SetTarget(s.chtg)
	e3:SetOperation(s.chop)
	c:RegisterEffect(e3)
end
function s.ffilter(c)
	return c:IsFusionSetCard(SETCARD_ID_0)
end
function s.hspfilter(c, tp, sc)
	return c:IsControler(tp) and c:IsReleasable(REASON_SPSUMMON) and c:IsCanBeFusionMaterial(sc, SUMMON_TYPE_SPECIAL)
end
function s.hspchk(g, tp, sc)
	return Duel.GetLocationCountFromEx(tp, tp, g, sc) > 0 and g:GetClassCount(Card.GetRace) == #g
end
function s.hspcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	local rg = Duel.GetMatchingGroup(s.hspfilter, tp, LOCATION_MZONE, 0, nil, tp, e:GetHandler())
	return rg:CheckSubGroup(s.hspchk, 3, 3, tp, e:GetHandler())
end
function s.hsptg(e, tp, eg, ep, ev, re, r, rp, chk, c)
	local rg = Duel.GetMatchingGroup(s.hspfilter, tp, LOCATION_MZONE, 0, nil, tp, e:GetHandler())
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_RELEASE)
	local sg = rg:SelectSubGroup(tp, s.hspchk, true, 3, 3, tp, e:GetHandler())
	if sg then
		sg:KeepAlive()
		e:SetLabelObject(sg)
		return true
	else
		return false
	end
end
function s.hspop(e, tp, eg, ep, ev, re, r, rp, c)
	local g = e:GetLabelObject()
	Duel.Release(g, REASON_SPSUMMON)
	g:DeleteGroup()
end
function s.indcon(e)
	return Duel.IsExistingMatchingCard(aux.TRUE, e:GetHandlerPlayer(), LOCATION_FZONE, LOCATION_FZONE, 1, nil)
end
function s.chcon(e, tp, eg, ep, ev, re, r, rp)
	local ec = re:GetHandler()
	local b1 = re:GetHandler():IsRelateToEffect(re) and ec:IsSetCard(SETCARD_ID_0)
	local b2 = re:GetActivateLocation() == LOCATION_MZONE and not ec:IsLocation(LOCATION_MZONE) and ec:IsPreviousSetCard(SETCARD_ID_0)
	return rp == tp and re:IsActiveType(TYPE_MONSTER) and (b1 or b2)
end
function s.chtg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(aux.TRUE, rp, 0, LOCATION_ONFIELD, 1, nil)
	end
end
function s.chop(e, tp, eg, ep, ev, re, r, rp)
	local g = Group.CreateGroup()
	Duel.ChangeTargetCard(ev, g)
	Duel.ChangeChainOperation(ev, s.repop)
end
function s.repop(e, tp, eg, ep, ev, re, r, rp)
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_ONFIELD, nil)
	Duel.Destroy(sg, REASON_EFFECT)
end

