That is what I do. I only have one legendary card (Scarred Llama Mage) and I got that one from a pack. However, when you are in Bronze level, your DEC doesn't accumulate very quickly, so I have to watch the cards until I find one I like enough to use frequently before I invest in any. I had made a note to look deeper into Armorsmith before, but just hadn't pulled the trigger, yet...well I did today. I bought 5 and combined them into a level 3. Now I just need to upgrade my Devine Healer (have to wait until I earn more DEC).