Its good for new players, or if youre just looking for a crash course on the format
There are also creature-lands like Lair of the Hydra that have an activated ability that animates them into creatures, and some planeswalkers, including Gideon-type walkers like Gideon, Ally of Zendikar and Kaito, Bane of Nightmares, that have activated abilities or triggered abilities that let them become creatures
Shoutout to Spikefield Hazard for hitting players and exiling, both relevant lines of text, Song-Mad Treachery in general (It mostly doesn't matter how much a given threaten effect costs, as on a good day it'll be the last spell you cast), and Malakir Rebirth/Sejiri Shelter for being great at the low threat count decks (prowess) that I love encouraging
We iterated a lot to get to the proper set size and the specifics of the draft format right, but Corey's going to cover some of that and a bunch more in his article, which covers the set design and play design processes in depth