Crystal Barricade gives you hexproof and prevents noncombat damage thats done to other creatures you control
Hakka, Whispering Raven might let you scry 2 when it hits an opponent, but it also bounces to your hand so you'll likely only get to do that every other turn at best
Other cards that will likely be key to such a strategy include Helping Hand, Thought-Stalker Warlock, and Treacherous Greed
Now that we have colorless needs for our deck, lands such as Kor Haven, Keldon Necropolis, and more rise in value to my mind
If you want to get reacquainted with the set, then check out my Commander Set Review for Battle for Baldurs Gate
Windgraces Judgment Casting too much one-for-one removal in Commander leads to you falling behind in the grand scheme of things, which is partially responsible for everybody running a billion board wipes