Rewards obtained at the end of the Draft run increase by the number of Victories.  You can obtain Cards (including a Legendary Card!), Booster Packs, Crystals and Blackstone from Draft runs, provided you reach the appropriate Victory count.

There are two types of Draft run, Free and Premium. You have one Free run every day, meaning you can play Draft at no cost and obtain the rewards based on your number of Victories. You can also play Premium runs by spending Blackstone, which offers increased rewards compared to Free Draft runs, including guaranteed prizes you can collect regardless of the result, even with 0 victories.