Two mana rocks like all rocks have gotten better over time
Messing around with summons and shield counters and stun counters just sounds enjoyable, even if it comes off as a bit complicated for a Commander precon
By putting Starfield of Nyx in Magic Origins, WotC ensured that it will only interact with Theros Block for a few months before the Gods and Eidolon of Blossoms rotate out of Standard forever
Given how easy it is to create the Darkstar token and that it doesnt cost any additional mana, Rufus Shinra is a great card for giving you continual fodder for your sacrifice outlets, but also just for good board presence
However, for casual play, open-play league nights, or Infinity Constructed events, you can use any card ever printed
Its powerful and generic, but I think you can build some fun things with it