That's a good way to hurt nunu even more.
It's a form of CC that can interrupt and Riot has already said they don't want this kind of power in a summoner spell.
Play a character with a Silence if you want to do this.
Damage-oriented casters (Fiddle, Ryze, Malzahar, Swain, Karthus) already suck - Vlad being the only exception due to crazy survivability and constant DPS rather than burst.
Ohai my name's garen, you think you can flash/ghost away from me and my spin2win, not anymore! 5 seconds of silence, DEMACIAAAAA
So I can have my whole team running "Squelch" and shut the whole opposing team down during a teamfight. No thank you.
This wont ever happen because it gives anyone an on demand interrupted for channeling spells which would be abused at mid/ highlevel play
Too many silences would break the game.
Mana Burn in generally isn't favoured by Riot staff.
That would be a horrible idea. An ability that removes channeling/ shuts down mages.
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