Disruptor Flute

Naming a card to shut it off is old technology: Meddling Mage keeps a named card from being cast, Nevermore locks one out entirely, Pithing Needle switches off the activated abilities of a named source. What this colorless slot does is fold two of those jobs into one and hand them to any deck at any table. Choose a name, and every copy of that card costs three more to cast while its nonmana activated abilities go dark. That second clause is the part worth dwelling on: it does the same work as Pithing Needle while also taxing the spell itself, so a named planeswalker gets pricier to deploy and can't tick, a manland can't animate, an equipment can't equip. The flash is what turns a proactive lock into a reactive one. Instead of showing the wall early and telling the opponent exactly what you fear, you hold up mana, watch them commit, then name the piece they were building toward at instant speed: a soft counter that leaves a permanent behind. The tax rather than a hard denial is the honest limit here; a determined opponent can still pay the three, and the name is locked the moment the artifact enters, so a misread costs you the whole card. It is the answer to the problem hatebears and prison decks have carried for years: needing to name a threat without color-locking the deck or revealing the plan a turn early.