Walking Ballista on the other hand, while also a powerful and flexible card, is likely absent because of the two card combo it creates with Heliod, Sun-Crowned that was a defining feature of Pioneer until it was finally banned
And if you've got too many cards on hand to draw, you can temporarily tuck them away by tapping Gustha's Scepter
Other than that, he is nothing special, but he gets a background, which is hilarious
Cards like Neyith of the Dire Hunt help you to keep drawing cards while your creatures fight while cards like Zopandrel, Hunger Dominus, and Mr Orfeo, the Boulder boost up stats to make your creatures all massive threats
Eye of Ugin gives a static two-mana reduction on all of your Eldrazi, which wasn't super exciting at first when all Eldrazi cost seven or more mana