Per usual, illustration rare cards serve as highlights, with artists tapping into a myriad of different styles and themes throughout
On top of that, Haste Magic essentially draws you a card, which I think makes this a decent card overall
Every 1,000 XP nets you one Mastery level on the Mastery track, and each level has the possibility for extra goodies
In MTG, sphinxes would eventually graduate to become one of the iconic Blue monsters -- fitting with the riddle theme and Blue being associated with knowledge
Its about the permanents which trigger off of life gain and the ability to more easily spend life as a resource
Conclusion I think that most Commander decks will benefit from playing a board wipe or two, because you simply cant guarantee that the natural variance of the format will always be in your favor