A great collection tracker with what I consider is the best free card scanner in the appstore. Devs deliver updates constantly.
Is still in development, there are some minor bugs and issues.
My Review will cover only collection tracking since is the only use I cureently give to Mage. Any deckbox.org, mtgcollectionbuilder or mtggoldish user should consider giving it a try. You can export cards easily and offers a comfy interface for consulting, sorting and brewing.