It find an Elf you really want, and untaps your Marwyn or Selvala or land enchanted with Elvish Guidance (or your Gaeas Cradle, if youre a lucky son of a gun)
Blink the summons right before they go away, and you have a nice engine going on, besides all the crazy stuff that you can do with Agent of Treachery or Atraxa, Praetors' Voice
If your commander would be put into your library, hand, graveyard or exile from anywhere, you may return it to your command zone instead
And, hey, if youre not looking for something quite that big but want the highest quality around, Vault X sells smaller sizes, down to 9, and 4 pockets
After blinking" Akroma we deal with her new incarnation", which is in no way connected to its past lives
Fair but on theme makes this card playable