Necropotence

The card that taught Magic's designers what life-as-a-resource actually costs. The trade looks symmetrical on paper: pay life, fill your hand, skip your normal draw step. In practice it is the most lopsided bargain ever printed, because life is only a real resource when you are losing, and the deck this enchantment built was never losing. The structural sleight of hand runs deeper than it looks: the cards are exiled face down and wait until your end step to enter your hand, which is not a draw at all. That distinction matters. It dodges every effect that punishes drawing, and it removes any instant-speed flexibility, because you commit the life first and only receive the cards later. That constraint was meant to balance the rate. It did not. The Necro-discard and later Necro-donate decks converted a mountain of cards into a guaranteed kill long before any life total came due, and the format-warping pressure was severe enough that the card has been banned or restricted across nearly every constructed environment it has touched.

The deeper legacy is the philosophical line it drew. After this, Wizards priced card advantage in life with extreme caution, and the lesson echoes through cards like Yawgmoth's Bargain, which costs more and still drew scrutiny. The skipped draw step and the graveyard-exile clause are framing on the real statement: there is a rate of cards-per-life that simply breaks the game, and this is the card that found it.