fix 生贄の祭壇

c21070956.lua

@@ -11,26 +11,22 @@ function c21070956.initial_effect(c)
 	e1:SetOperation(c21070956.activate)
 	c:RegisterEffect(e1)
 end
+function c21070956.filter(c)
+	return c:IsAbleToGraveAsCost() and c:GetTextAttack()>0
+end
 function c21070956.cost(e,tp,eg,ep,ev,re,r,rp,chk)
-	e:SetLabel(1)
-	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToGraveAsCost,tp,LOCATION_MZONE,0,1,nil) end
+	if chk==0 then return Duel.IsExistingMatchingCard(c21070956.filter,tp,LOCATION_MZONE,0,1,nil) end
 	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
-	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToGraveAsCost,tp,LOCATION_MZONE,0,1,1,nil);
+	local g=Duel.SelectMatchingCard(tp,c21070956.filter,tp,LOCATION_MZONE,0,1,1,nil);
 	local atk=g:GetFirst():GetTextAttack()
-	if atk<0 then atk=0 end
 	e:SetLabel(atk)
 	Duel.SendtoGrave(g,REASON_COST)
 end
 function c21070956.target(e,tp,eg,ep,ev,re,r,rp,chk)
-	if chk==0 then
-		local res=e:GetLabel()~=0
-		e:SetLabel(0)
-		return res
-	end
+	if chk==0 then return e:IsCostChecked() end
 	Duel.SetTargetPlayer(tp)
 	Duel.SetTargetParam(e:GetLabel())
 	Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,0,tp,e:GetLabel())
-	e:SetLabel(0)
 end
 function c21070956.activate(e,tp,eg,ep,ev,re,r,rp)
 	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)