What are the contents and features of the M15 Deck Builder's Toolkit?

The M15 Deck Builder's Toolkit contains 125 semi-randomized cards, including land cards, creatures, and spells. It also includes four booster packs from the Magic 2015 set, as well as a storage box, deck builder's guide, and a set of basic land cards. This toolkit is designed to help players build and customize their own Magic: The Gathering decks.