Lich's Tomb

Zero stops being a loss condition; the board becomes the loss condition instead. That inversion is the entire engine: life total ceases to function as a clock, and every point of life you shed converts directly into a sacrifice for each point lost. Damage, Phyrexian payments, drain effects, the upkeep tax of your own greedy cards, all of it now bills you in permanents rather than in life. It trades one failure state (dying) for another (emptying your own battlefield), and the cleverest builds treat that second clause as an asset rather than a tax. Aristocrats engines, token swarms, and anything that wants permanents in the graveyard read the sacrifice trigger as upside, feeding it expendable fodder and mining each loss of life for another trigger. The fragility is just as sharp: a single large burst, a wheel that costs you a fistful of life, a board wipe that drains you in the doing, can strip everything you control in one resolution, with no life buffer left to absorb it. That razor edge is what keeps it a deckbuilding commitment rather than a safety valve. It does not protect you so much as redefine what protecting yourself costs, demanding a deck deep enough in disposable permanents to keep paying the toll it imposes for every point you would otherwise have simply lost.