Marketback Walker likely has the most potential in the Pioneer format
However, since paid players progress much faster, they have a better chance of accessing strong cards like the EX versions of top Pokemon, which can impact the metagame
They do destroy enchantments a lot and the occasional artifact (Kor Sanctifiers, for example), but they also really like enchantments too (especially Academy Rector, Nomad Mythmaker, Monk Idealist), they gain you a ton of life, and they rarely have any useful combat abilities beyond vigilance and protection
With any luck, you do not naturally amass twenty charge counters on it, although its a sick inclusion when facing your buddy who never wants the game to end
For those players, the set was too bleak and icky, and they wished the set wasn't quite so monolithic in its overall feel. Here's one highlight from The Brothers' War: Many players liked having a set that looked back at one of Magic's greatest stories