We could work with any hero actually, it's just that at night he would be abusing his silence and render an important hero of ours useless.
But Doom sounds viable, it's just a matter who silences who first. Thanks for the suggestion pipser
EDIT: Thanks for the tip, HappyCat. I wouldn't worry about mid/late game if we reach it without any problems, but it's the early game that worries me the most. Omni could work if only he is not silenced first or he has adequate mana; which he does not at early game.