Exactly what does the Silencer's power prevent? In most cases, the power is clear, but there are plenty of times when it isn't. Any attempt at a deal is an automatic failure. Normal play of cards that need no explanation is allowed. Any card or other game part with an ambiguity, such as one that needs the player to specify a target of player of effect (like the Plague Edict) are prohibited by the Silencer because they need some form of communication to identify which player is affected.
The Silencer DOES stop these powers:
Anomaly (partially) Aura Berserker (challenges) Calculator Chronos Crytal Delegator Demon Dictator Diplomat Doppelganger Extortionist Force Gnome Grudge (if choice) Healer Hurtz Judge Lloyd Loser Magnet Mesmer Mind Mirror Mutant (from other players) Negator Obverse Pavlov Phantom Philanthropist Pirate Plant Prolong Prophet Queue (timing) Seeker Serpent Silencer Siren Skeptic Sniveler Sting Trader Visionary Will (if base has more than one color) Witch Wrack
The Silencer does NOT stop these powers:
Amoeba Anomaly (partially) Anti-Matter Aristocrat Assassin Berserker (card value) Boomerand Bully Busybody Butler Cavalry Changeling Chosen Clone Connoisseur Deuce Disease Dragon Empath Entrepeneur Ethic Filch Filth Fungus Gambler Ghost Gorgon Grief Grudge (if only one) Industrialist Insect (depends on power being copied) Laser Machine Macron Miser Mutant (from deck) Oracle Pacifist Parasite Pentaform Queue (turn order) Reincarnator Reserve Schizoid Sorcerer Spiff Subversive Symbiote Terrorist Vacuum Vampire Virus Void Vulch Warpish Warrior Will (if target base has only one color) Worm Wraith Zombie