Artifacts in the 94 Cube are both common enough and powerful enough that a main-decked Shatter or Detonate is usually going to find a target, and Shatterstorm is quite the blowout against some decks
Knowing that itll soon dominate the tournament scene already makes me wistful for this years Tarkir: Dragonstorm and the simpler era it harkened back to
Repeatable removal is powerful even if it's just bouncing a creature to hand, and you may have creatures you want to bounce so you can recast them
Theres significant thought behind each artists signature, and if you ask ten artists, youll get ten stories of outside inspiration, practice, and hundreds of iterations and tweaks
Teferi, Master of Time I typically avoid planeswalker ults on lists like this because achieving them is incredibly inconsistent, but Teferi, Master of Times static ability makes it much more reliable than most and all the card filtering helps sculpt the perfect hand for those two extra turns
The bad