Instead of playing on a play mat like the game usually is, Gateway comes equipped with a board that has a play area for your active cards and your inkwell, as well as a lore tracker in the middle of the board
Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the copied creature will also work
The commander is the new spacecraft card titled Hearthhull, the Worldseed, which appears to be some sort of organic vessel capable of terraforming other planets, piloted by a race of buglike aliens called the Eumidians
If you can get a copy of Unpredictable Cyclone on the battlefield and cycle Street Wraith, the results are anything but unpredictable: you'll end up with an Emrakul, the Aeons Torn (which you get to cast, giving you an extra turn!) 100% of the time
It's a great entry point into the competitive meta as it is relatively easy to pick up and play effectively