K'rrik, Son of Yawgmoth
K'rrik, Son of Yawhmoth is one of the 'blackest' commanders in EDH. It uses two of blacks arche type mechanics: pay life and gain life extremely well and in synergy. K'rrik decks can be built into any direction, but it definitely shines with lifegain.
Themes for K'rrik, Son of Yawgmoth
Mono black lifegain
Mono black has multiple ways to gain life: creatures ETB triggers, creatures with lifelink and draining life from opponents. Lifegain decks are very trigger heavy and the understanding of priority and stack is needed to steer the decks well.