Kalakscion is a cheap, aggressive mono-black threat that turns your dead and sacrificed creatures into raw power and life loss. You flood the board with cheap, expendable bodies, feed them to sacrifice outlets and Kalakscion's own appetite to grow it into a lethal evasive attacker, while aristocrat drains chip everyone down. The deck plays a grindy attrition game—each board wipe just refuels your engine—then closes with one big swing or incremental drain.
Mono-black gives access to the deepest pool of tutors, removal, and recursion in the format
Sacrifice/recursion shell is extremely resilient to board wipes and spot removal
Cheap commander (MV 3) comes down early and pressures life totals quickly
Aristocrats payoffs convert every death into reach, so you don't need combat to win
Easy access to repeatable card advantage and ramp via rituals and treasure
Single-color means no access to counterspells or efficient artifact/enchantment removal
Relies on the graveyard—graveyard hate hits the whole deck hard
Sacrifice-fueled drains can be slow against decks with strong lifegain or fast combo
If the commander is your main payoff, repeated removal taxes your mana and recursion
Lacks blue's protection, so a committed attack can be blanked by a single instant