Psychic Whorl
Two-card discard has always been the awkward middle child of black's disruption suite: strong enough to matter, expensive enough that the plain versions like Mind Rot rarely earned a slot without a rider. The rider here is a tribal one. The base effect is a flat, unconditional strip of two cards from a chosen opponent's hand, and it does that work regardless of your board. What the Rat condition adds is a self-serving second half: control one, and the discard also lets you sculpt your own draws, filling the graveyard while smoothing toward whatever you needed the discard to protect. That conditional split is what balances the card. It rewards a Rat-centric build without punishing anyone who casts it off a naked hand, so the floor stays honest and the ceiling belongs to the tribe. Surveil is the right tool for the payoff, too: it is graveyard-agnostic value that plays equally into a reanimation shell, a delirium count, or simple card selection, so the reward bends to whatever your build is trying to accomplish rather than forcing a single line. Black hand-attack sorceries have a long history of being built around a specific engine while remaining castable by anyone; this one hands the generic effect to every player and reserves the upside for those who assembled the board state to earn it.
