Skirsdag Supplicant

The word that governs everything is "Each": every activation drains the controller two life as reliably as it drains the opponent, so this is a shared clock rather than a one-sided bleed. The math only tips in your favor when you are already ahead on the race or hold some way to swing the totals back, because the loss is symmetric on both sides. What the ability does well is convert a discard that would otherwise be a liability into a repeatable life-payment: a graveyard payoff you want in the bin, a flashback spell, a creature worth more dead than in hand. The black mana, the tap, and the discard together price each activation high enough in resources that this is never the primary plan, only a slow valve for grinding a stalled board over several turns. The 2/3 body matters more than the rate suggests; it blocks early attackers and survives long enough to keep ticking, which separates a clock from a one-shot. Note that the two is life loss, not damage, so prevention and protection do nothing against it, and because it is not a drain, the controller never recoups what the ability spends. This belongs with the repeatable life-loss outlets that trade raw card economy for inevitability: an engine for closing out games already mostly won, not one that wins them outright.