The Baron of Blood has a lot going for him
3) The powerful colorless matters cards are clunky but powerful, like Kozilek, the Great Distortion, and the decks that cast them are activating Blighted Woodland or casting Explosive Vegetation to find Wastes
Thats insane value, and even if you lose your 4-powered creature, you get to put a +1/+1 counter on a 3/3 and start the process over again
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)
Liliana of the Veil [Best Early-Game Disruption Walker] When Liliana of the Veil first appeared, she completely changed expectations around what a three-mana planeswalker could do