The reason is explained in this article, but the general reason is that lands are best for casting your commander and ramping, outside of that they have very little function
There are also 20 lore cards which feature story details and a little flip-book picture on one side, and part of the art for two larger images on the other
Despite the effect of transforming Battle being a triggered ability , its controller exiles the permanent and then casts it without paying the mana cost , opening up space to interact with Battle on the stack with Make Disappear, or other counterspells, or even to bounce them on the stack, with Venser, Shaper Savant and the like
2 Premium foil lands
Some cards see more play than most, however, due to their universal usefulness
Key Cards Dion, Bahamut's Dominant / Bahamut, Warden Of Light The commander of the deck, Dion, Bahamut's Dominant is great Knight support, giving them all flying during your turn