It includes six new cards: Call Forth the Tempest, Nazgul Battle-Mace, Witch-king, Sky Scourge, Mordor on the March, Fell Beast of Mordor, and Minas Morgul, Dark Fortress
If you roll a die for any other reason (to simulate a coin flip, to choose pizza toppings, to create alternate timelines), that roll doesn't count
(5/3/2019) Karn's last ability can't get a face-down card in exile, even if you know it's an artifact card
Reds removal was basically limited to just Lightning Bolt, with options like Rending Volley or Roast available as sideboard options, but ultimately too narrow or inefficient to play in the main deck
I dont think that Step Between Worlds ranks as compared to existing draw-sevens for a powered Cube, but it is a potentially exciting option for slightly lower-power environments
Trust your gaming community and go see some fellow players