KMC is best known in the Magic community as a brand for their Perfect Fit inner sleeves and Hyper Mat variants, especially useful if you're attempting to double sleeve your decks
Includes a reversible Teferis, allowing flexible gameplay with the depiction of Mimir's wisdom
Phyrexian Arena looks like it will be the business, but its no match for blue's best enchantment, Rhystic Study
Just like how those clamouring for Hogaak, Arisen Necropolis or Faithless Looting to get banned in Modern a couple of months ago should have been registering the deck all along, if you want to win and genuinely believe a card needs banning in Pioneer, then you should be playing it and trying to break it
Selling directly online usually costs around 10-15% so you net 85-90%
Getting enchantments is also huge, considering heavily-played cards like Underworld Breach and strong enchantment creatures