Enemy of Enlightenment

The printed 5/5 is a ceiling this creature almost never touches on arrival. Each card in your opponents' hands shaves a point from both power and toughness, so casting it while anyone holds a normal grip drops its toughness to zero or below and it dies as a state-based action before it can attack, block, or even see your next upkeep. That failure mode is the whole design tension: the body only exists when your opponents are near empty, and the symmetric upkeep discard is the mechanism that manufactures that condition. Resolve it into a hand of two or three and it lands as a small flyer, then the discard grinds both sides toward hellbent while the Demon inflates each turn as its debuff shrinks. The scaling keys off cards in hand rather than cards drawn or graveyard size, which is a pointed choice: it punishes players who sit on resources and rewards you for having already emptied your own hand onto the board. The two clocks are wired to converge on purpose, the discard clearing the very cards that keep the Demon small, but the sequencing is unforgiving. There is no window where you dump this into a full grip and let the upkeep bail you out; it has to survive resolution first, which means you commit it only once the game has already bent toward the emptiness it needs.