Exile is often been a place to temporarily hold cards for other abilities like suspend, adventure, and flicker effects
Jace, Unraveler of Secrets is the classic formula: 5-mana card advantage on the +1, removal on the -2, and an emblem that will annoy opponents for the rest of the game as its ultimate
Secret Lairs are a way to get cards that are needed for EDH, Cube, or what have you, in a very different art style, and directly from WotC, without the need for the secondary market or to open it in a booster pack
Starwinder Starwinder is a super draw spell since you get cards equal to the combat damage dealt to a player
You can mix and match options using the View as & Group by drop-downs above
You at least had to be able to get it out of a Commander Precon