Brink of Madness

The discard-as-payoff enchantment asks the question most black decks built around emptying their hand never want to answer honestly: what do you do once you are hellbent and the opponent still has a grip full of answers? The conventional approach points edicts or burn at the board and grinds; this instead converts the empty hand into a threat, stripping the opponent of every card they hold on a future upkeep. The setup, not the resolution, is what costs you something. The trigger checks at the beginning of your upkeep, and that timing is precise: the upkeep step precedes the draw step, so you have to enter the turn with a genuinely empty hand to fire it. You bottom out at the end of one turn, then the next turn's upkeep arrives before you draw, the condition holds, and the enchantment sacrifices itself to empty their hand. That means it is not a card you cast and coast on; it is a card that asks your whole game plan to reach zero on cue. A discard spell takes one card now and costs you one in hand; this takes the entire hand later and demands you first run yourself dry, betting that your empty grip beats their full one. It rewards the kind of deck that treats an empty hand as a stable state rather than an emergency: not a removal spell or a tempo play, but a wager on who can run out first and still be winning.