Its controller mills three cards
With Doubling Season in play, Planeswalkers will enter the battlefield with double the normal amount of loyalty counters, and the curve is perfect: turn 5 Doubling Season, turn 6 play Teferi, Temporal Archmage, which will enter the battlefield with double the loyalty, and you can instantly get your emblem, which will stick around until the end of the game and just make things silly
For two mana, it basically starts out as an indestructible swamp land that can tap to generate one black mana
The four decks coming back are "Devour for Power" (helmed by The Mimeoplasm), "Built from Scratch" (the Daretti, Scrap Savant deck), "Wade into Battle" (with Kalemne, Disciple of Iroas leading the charge), and "Breed Lethality" (with everyone's favorite proliferator, Atraxa, Praetors' Voice)
Booster Pack (Magic Portal | Magic Cards) prices are based on the historic sales
In Zendikar Rising, we return to the mana-filled plane to deal with the mysterious and dangerous creatures that live there now after the aftermath of Eldrazi's defeat