Authority of the Consuls has certainly helped in recent months, but poor White control decks have, at least off-and-on, been knocked around silly by Urabrask's Forge and other pesky artifacts
Murktide Regent is an absolute monster that can easily shut down a game once it enters the battlefield, and the nature of the card means that you'll probably have at least one counterspell to protect it once it's out
Its scarcity as well as playability in Old School for being a versatile Removal All-Star in every deck is pushing its price almost into our Top 10
Aang, Swift Savior is the biggest hitter so far, selling for between $1,600 and $2,750 on TCGPlayer, with current listings pushing the range to $1,900-$3,500
Strategic complexity This is not only fine at common (provided it doesn't have one of the other two types of complexity) but encouraged, as it helps to create depth for the more advanced players