Discarding your hand often doesnt matter with cards like Yawgmoth's Will, and occasionally it even becomes a boon with cards like Infernal Tutor and Echo of Eons
If you put a Town card into your hand this way, you gain 2 life
If your goal is to fill the graveyard as quickly as possible, Golgari Grave-Troll is one of the best ways to do it, allowing you to skip your draw step to instead mill six cards and put the Grave-Troll into your hand
Even if you have nothing in your deck that can cast things from your library, it's still a free dork that returns to your deck for more card drawing later
It goes without saying that the most powerful deck you can build in Alpha involves most or all Power Nine, such as Black Lotuses, Moxen, and draw spells like Ancestral Recall and/or Timetwister
Its a 5/5 flier with firebreathing, so it hits hard and can pump itself to end games fast