First of all, for this list we only look at base versions of legal cards , so no special anniversary or collector editions, alt-arts, promos, unknown events, or any of that kind of thing
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
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
It is lower life overall and significantly lower right away