Silence (ability)
From Liquipedia Hearthstone Wiki
Silence removes all effects from the targeted minion.
Interactions[edit]
Silence nullifies any text the card has, including effects that have been cast on it. It removes Deathrattles, effects like Aldor Peacekeeper's Battlecry and Ancient Watcher's inability to attack. Silenced minions still benefit from buffs from Stormwind Champion and Dire Wolf Alpha.
As far as Deathrattles are concerned, Transform effects like Hex, Polymorph and Tinkmaster Overspark include a Silence, followed by removing the minion and summoning a new one.