Tasha's Hideous Laughter

Mill has always counted cards: exile or bin twenty, thirty, forty off the top and hope the clock runs out before yours does. This one counts something else. Rather than a fixed quantity, it burns until the exiled pile reaches total mana value twenty, which hands the yield over to the opponent's curve. Point it at a cheap aggro deck packed with one- and two-drops and the quota takes fifteen cards or more to satisfy: a brutal slice of a library for three mana. Point it at a top-heavy control shell full of six-drops and expensive finishers and three or four cards clear the bar, leaving the caster underwhelmed. That swing is the payoff's entire personality. Where most mill treats every card as a single tick toward a threshold and ignores curve completely, this one makes the threshold sensitive to density, favoring the caster who has scouted the opposing deck the way a burn player watches a life total and knows when the arithmetic breaks their way. The exile clause matters structurally too: cards are removed from the game outright, so decks that rebuild from their own graveyard find nothing waiting to be reclaimed. It is a mill effect engineered around the one axis the archetype normally treats as noise, demanding you understand the target's composition, not merely how large its library happens to be.