Dreams of Steel and Oil
Discard has always struggled against decks that dodge the tempo cost by keeping their threats in the graveyard, and this rewrites the exchange to close that door. A single black mana buys two exiles instead of one: a live card stripped from hand, and a spent one lifted out of the graveyard where most discard leaves it untouched. The narrowing to artifacts and creatures is what pays for that reach; you cannot name their counterspell or their board wipe, so this is a threat-answering tool rather than a general-purpose Duress. The graveyard clause is the part that reshapes strategy: against recursion, reanimation, and escape-style value engines, the card denies the second life a threat was counting on, and against artifact-centric decks it can hit both a piece in hand and a piece already in the yard. Exile matters here too, since the whole point is to put the card somewhere the opponent's graveyard synergies can never reach it. What you give up is flexibility against the parts of a deck that never touch the yard: a control shell with counters and sweepers reveals a hand full of cards you are not allowed to take. The design lands on a discard spell built specifically for the matchups where graveyard interaction, not raw hand disruption, is the axis that decides the game.
