Gibbering Descent

The upkeep tax looks symmetrical and then quietly stops being: each player loses a life and discards every turn, forever, but only the controller is built to escape. Hellbent is the release valve. Empty your own hand and you skip your upkeep step entirely, sitting out the loss while the opponent keeps bleeding and discarding into nothing. That is the asymmetry the whole card is engineered around, and Madness is what makes it cheap to reach. The card wants to be discarded rather than hardcast, so any looter, rummager, or Tortured Existence-style pitch becomes a delivery system: dump it into exile and recast it for the cheaper madness trigger, advancing toward your own empty hand in the same motion that deploys the engine. Note the boundary on that trigger: it fires on discard from hand, not on a card leaving the library, so milling does nothing to set it up. The knot worth admiring is the feedback loop. The painful half of the enchantment is the forced discard, and the way to dodge it is to have already discarded everything, which Hellbent then rewards by switching your upkeep off. It is hellbent enabling hellbent. The constraint that keeps it honest is speed: this is a drain, not a kill, and against any deck producing a real clock the symmetry runs long enough to bury you alongside them. The payoff comes from going to zero cards on purpose and weaponizing the slow bleed from the other side.