Its one of the most popular commanders judging by lists posted online, and one of the reasons is that it messes with card draw
4 K'rrik, Son of Yawgmoth A Mono-Black Phyrexian Horror Minion, while K'rrik, Son of Yawgmoth may have a mana value of seven, three mana of its mana cost comes in the form of Phyrexian Mana, meaning it can often be cast for a mere four mana
This isn't the most exciting payoff, but it's fine -- and it's a two-card combo with Bloodthirsty Conqueror
Thats all from me for today
YOU CAN NEVER DISCARD EVERYTHING In a vacuum, its not hard to see the theoretical justification for playing discard spells
Void Winnower really does lock things down for a bit until someone pulls a Swords to Plowshare or Path of Exile to get rid of it, and with the swarms of other nasty stuff you will be dropping, there is a good chance they already blew a lot of those