You can find pretty much every effect on a legend, with cards like Ertai, Ressurected and Loran of the Third Path providing a huge amount of options, together with other legends-matter synergies like Reki, the History of Kamigawa
There are better Rakdos (red/black) commanders to build around, and even in the deck there are much better creatures you can run in its place
And the system keeps growing
From what I can tell it has MOST of the cards on forge, although several may have slipped through the cracks, because of various downloading errors
Obelisk the Tormentor is the easiest to snag as the first login bonus on the 7-day track
Every time you open a pack, you earn five pack points, which you can directly trade in for a card of your choosing