From the release:
We at AGM are very proud to release our first 1 Player sets! Rivercrest Swordsmen and Rivercrest Scouts are also now available for purchase on the store and as part of the Builders Alliance starter bundle.
Start building your Drake army with $49.99 army bundles that include a dragon, supporting troops and creatures, a deck of cards, and free dice! Not only that, but everything in the store is on sale for 25-35% off!