We don't know how many of the Amazon preorders were grabbed by resellers, but people are already trying to flip their copies, which they won't actually have for another four months, on eBay for hundreds of dollars above their retail price
Niv-Mizzet, Visionary Niv-Mizzet, Visionary feels rather tired, as weve gotten so, so many Niv-Mizzets recently
But with so many black creatures out there, knowing which ones you want to put into your 99-card Commander deck can be difficult
All the others are spells which is both a pro in some builds and a con in others
There will often be cards from that set included in the Masterpiece Series (like how the Battle for Zendikar rare dual lands were included in Zendikar Expeditions ), but they will typically exist in the set in a traditional frame in their normal rarity in addition to appearing in the Masterpiece Series
Duskmourn: House of Horror has potential, but we'll have to wait and see