--双穹の騎士アストラム
function c21887175.initial_effect(c)
	--link summon
	c:EnableReviveLimit()
	aux.AddLinkProcedure(c,c21887175.matfilter,2)
	--cannot target
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetCode(EFFECT_CANNOT_BE_EFFECT_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCondition(c21887175.tgcon)
	e1:SetValue(aux.tgoval)
	c:RegisterEffect(e1)
	--atk limit
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(0,LOCATION_MZONE)
	e2:SetCode(EFFECT_CANNOT_SELECT_BATTLE_TARGET)
	e2:SetCondition(c21887175.tgcon)
	e2:SetValue(c21887175.atlimit)
	c:RegisterEffect(e2)
	--atk up
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_ATKCHANGE)
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCode(EVENT_PRE_DAMAGE_CALCULATE)
	e3:SetCondition(c21887175.atkcon)
	e3:SetCost(c21887175.atkcost)
	e3:SetOperation(c21887175.atkop)
	c:RegisterEffect(e3)
	--to deck
	local e4=Effect.CreateEffect(c)
	e4:SetCategory(CATEGORY_TODECK)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_TO_GRAVE)
	e4:SetProperty(EFFECT_FLAG_DELAY)
	e4:SetCondition(c21887175.tdcon)
	e4:SetTarget(c21887175.tdtg)
	e4:SetOperation(c21887175.tdop)
	c:RegisterEffect(e4)
end
function c21887175.matfilter(c)
	return c:GetSummonLocation()==LOCATION_EXTRA
end
function c21887175.tgcon(e)
	return e:GetHandler():IsSummonType(SUMMON_TYPE_LINK)
end
function c21887175.atlimit(e,c)
	return c~=e:GetHandler()
end
function c21887175.atkcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return bc and bc:IsSummonType(SUMMON_TYPE_SPECIAL) and bc:GetAttack()>0
end
function c21887175.atkcost(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:GetFlagEffect(21887175)==0 end
	c:RegisterFlagEffect(21887175,RESET_EVENT+RESETS_STANDARD+RESET_PHASE+PHASE_DAMAGE_CAL,0,1)
end
function c21887175.atkop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	if c:IsRelateToBattle() and c:IsFaceup() and bc:IsRelateToBattle() and bc:IsFaceup() then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetReset(RESET_EVENT+RESETS_STANDARD+RESET_PHASE+PHASE_DAMAGE_CAL)
		e1:SetValue(bc:GetAttack())
		c:RegisterEffect(e1)
	end
end
function c21887175.tdcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsPreviousLocation(LOCATION_MZONE) and c:IsSummonType(SUMMON_TYPE_LINK)
		and rp==1-tp and c:GetPreviousControler()==tp
end
function c21887175.tdtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToDeck,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,nil) end
	local g=Duel.GetMatchingGroup(Card.IsAbleToDeck,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.SetOperationInfo(0,CATEGORY_TODECK,g,1,0,0)
end
function c21887175.tdop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToDeck,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,1,nil)
	if g:GetCount()>0 then
		Duel.HintSelection(g)
		Duel.SendtoDeck(g,nil,2,REASON_EFFECT)
	end
end
