Insight showcase common.

This also seems quite similar to to many custom mechanics over the years - though restricted to an etb trigger which is weird. At first glance this seems like a lot of unnecessary revolving of cards.

The common variations which you are likely familiar with are often like (like the one in great designer search 2):

> "Archive" (To archive a card, exile it face down. You may look archived cards you own. If you would draw a card, you may put an archived card to your hand instead.)

Is library manipulation a theme here? That could mean that the set would be -preferring format like how many of the sets have preferred (torment, new phyrexia, etc).

From that theme I recall a mechanic from the past that created new mini-libraries or something like that - it was quite fascinating.