Cryptolith Fragment // Aurora of Emrakul

Mana rocks rarely arrive with a kill condition stapled to the back, but the fixing side here is built to be impatient: a tapped artifact that taps for any color, with the cost that every activation costs each player a life point, the controller included. That symmetry is the whole engine. The transform clause checks the entire table (each player at ten or less life, not just you), which makes the flip a shared clock that no single player fully owns. You can push it along with your own activations, but the rest of the threshold has to come from the game state itself: combat, other life-loss effects, the table racing each other toward zero. The artifact wants those totals to collapse, because once they do it folds into something that hunts. The flipped body is a flying deathtouch creature, but the attack trigger is the payload: each opponent loses three life, deepening the same spiral that summoned it. Note that it is loss, not drain; the controller gains nothing, so this is acceleration toward a shared bottom rather than a life-swing that pulls you back. The design rewards a board already trending downward instead of one you assemble from a healthy life total: a mana source that becomes a finisher only in a game grindy enough to walk everyone into the danger zone. The flavor tracks the mechanics cleanly, a shard of corruption feeding on diminished life until the horror behind it manifests.