Miasma Demon

Discard as ammunition is an old black bargain, but this one hands you the exchange rate: every card you pitch on the way in shrinks up to that many creatures by -2/-2 until end of turn. The trade is one-for-one in a way most sweeper-adjacent creatures are not. You convert cards in hand directly into board presence removed, capped only by how many bodies the opponent has committed and how much of your hand you are willing to empty. That framing matters because the effect is neither a wrath nor a targeted kill; it is a scalable soft sweep that answers a wide, low-toughness board far better than a tall one, and it struggles to close out a creature you cannot shave into lethal range. The demon plays best in decks already built to turn discarded cards into value, since the pitched cards feed reanimation, delve, and flashback rather than simply leaving. As a 5/4 flier for six, it does not need the enters trigger to earn its keep: pitch nothing and it is still an evasive clock. The pull between wanting cheap disruption early and hoarding cards to fuel the trigger later is the whole point, and it settles into midrange, where you have surplus lands and dead draws to burn. The larger the board it walks into, the more of your hand it can turn into corpses.