While there should always be options for this, it basically allows you to break the rule of one card in your Commander deck, and because its an Artifact, it can go in any deck
Josu Vess, Lich Knight Theres a reason Josu Vess, Lich Knight used to show up in Commander precons a lot: Its because its good
Skyclave Apparition has proven to not only be the best creature in Modern, but a pretty good creature in Standard and Legacy, too
If you need to hit your 4th land drop this turn Elder is of no help unless you happen to have a free way to sacrifice it
If you're lucky, or just planned ahead, you may cloak a card that has another ability to turn it face up, such as morph or disguise