What sets Darkstar Augur apart is the fact that it flies, and for four mana total, creates two of that same card draw effect thanks to offspring, pressuring players to find two removal spells or a sweeper rather than the usual one-for-one trade a Dark Confidant might elicit
Snoop allows us to combo off almost as if we were playing Splinter Twin getting to play our normal strategy (a tribal deck, rather than a tempo deck in Twins case) with a combo that can immediately end the game always looming for the opponent to worry about
A few goals of your planeswalkers should be to slow down the game, get more planeswalker abilities or loyalty counters, and use those final loyalty abilities to wreak havoc
Thraximundar [Best Table-Wide Sacrifice Pressure and Commander Damage] Thraximundar punishes every opponent by forcing sacrifices while growing into a lethal Zombie threat that ends games through commander damage
In the wake of these landmark Modern unbans, good sideboard cards are needed now more than ever