The Sultai colors are among the most played since they have tons of synergies to mess around with, but any of them are worth finding a spot in your deck
At its center is a place called "The Great Illuminary"
Even so, surveilling cards to your Graveyard will not just improve your draws and hands but also enables GY strategies and synergies such as Delve threats, Arclight Phoenix and others
Witness Protection was already borderline playable, but one of its weaknesses was the 1/1 could still easily end up doing 3 to 4 damage over the course of the game
Most of the cards that were initially priced high at release have dipped in value only a little bit, while several others have climbed up in price as the meta stabilized once players got their hands on the cards
We don't really have to guess anymore, now that we have an actual Splinter card