Firstly, be on the lookout for cards that make players lose 4 or more life when combined with Ystholas first trigger, like Will of the Abzan and Rush of Dread
Each pack contains 12 Magic cards, including 1 Mystical Archive card (Uncommon, Rare, or Mythic Rare), 1 Lesson card (Common, Uncommon, Rare, or Mythic Rare), 1 Rare or Mythic Rare, 1 foil of any rarity, 1 Wild Card of any rarity, 6 assorted Commons or Uncommons that are thematically connected (with Commons connected to other Commons, and Uncommons connected to other Uncommons), and 1 Land cardplus 1 Art Card and 1 Ad/Token or special card from Magic's history (a card from "The List")
And since we know that there are many cards in the new Standard that are graveyard-matters cards (along with an entire SECOND mechanic (Undergrowth) that is purely a graveyard-matters mechanic and a THRID partial-graveyard mechanic in Jump-Start), it's safe to say that Surveil has the potential to do a lot of damage in the new meta
No one was more excited about this than Mark Rosewater, he was the happiest I'd ever seen him (and he's generally a very happy guy)