Board Thread:Question and Answer/@comment-72.43.136.100-20150330154623/@comment-887715-20150403150511

Well, after a while playing, I start holding them inside the Present first, then only take them out when it's about time(one thing to do that is to get your inventory to be filled by N cards first before taking any form of rewards, mostly from F/AWs; this way, they'll be sent into Present instead). Other than what I mentioned earlier, the other way is to expand your inventory with +5 boosters(150 Jewels per item), but there's a free +15 after completing Area 10 at Celestial Realm 1(which also opens up Celestial Realm 2).

There's also a section called Collection in the "Edit Unit" section where you can keep the cards too(and show them off by making them Public!), and is expandable as well(400 Jewels per page, though!).

I done expanding both inventory and Collection pages when I got my Magic School to Lv.6, though, but it's up to you whenever or not you want to keep leveling up your MS by then, but most improtantly, get your Castle to Lv.10 1st.