Double Colorless Energy A staple, of course
Instead, blue excels at artifact mana, cost reduction effects, and mana-generating enchantments that reward casting spells
This may seem like it's not that productive, as your opponent will often die to regular damage first, but a lot of what makes poison counters special in Phyrexia: All Will Be One is the Corrupted mechanic, which is an ability word that turns on when your opponent has three or more poison counters
With the exception of the Kaladesh block, Vehicles have also played a supporting role in sets, so many players enjoyed getting to have a set where Vehicles could shine
Due to the unique distribution model of this celebratory set, pulling an individual gold-foil leader from standard packs is brutal, appearing roughly once across hundreds of individual boxes
When synthesizing this list, I was looking at cards that are asymmetrical in their effect, hard to interact with, or have little ways to remove or stop them