Raiders' Wake

Two punishments stacked into one enchantment, and the order they fire in is the whole engine. The raid clause checks on your end step whether you swung that turn, then forces the targeted opponent to discard; the standing life-loss ability turns that discard, and any other discard the same opponent suffers, into two points gone. Run it alone and it is a slow attrition tax gated behind your willingness to attack. Pair it with any other forced-discard effect and the two halves compound: every card stripped becomes a Shock to the face, so a deck built to empty an opponent's hand stops being merely disruptive and starts closing games on its own.

The aggression clause is the cost that pays for the reach. Plenty of black enchantments drain on discard; what this one asks is that you commit to combat first, gating an already asymmetrical discard behind a tempo requirement that rewards a deck on the front foot rather than one durdling behind a wall. That makes it an oddly hybrid card: a discard-matters payoff that wants creatures attacking, sitting at the seam between aristocrats-style life-loss value and a pirate-flavored beatdown plan. The catch is that both halves die when the opponent's hand empties: no card to strip means no raid value and nothing for the life-loss trigger to key off, so the enchantment is only as live as your ability to keep cards in your opponent's hand to burn.