On Deafening Silence:
I haven't had the chance to test it much yet, but while I think that Stormanimagus is right that this card is great for Hatebears style decks, I also think that volrathxp is right that this card isn't format warping, because, let's be real, Hatebears is a fringe archetype.
I'd like to comment on one thing though: the time aspect. I think this is a greatly misunderstood concept when discussing Hatebears and other prison style decks.
The article says that "but that kind of turn does nothing to accelerate your clock in a game and gives your opponent all the time in the world to find an answer". I find that statement wrong. Sure, this card in itself doesn't accelerate your clock, but it doesn't give your opponent "all the time in the world". I think it's a mistake to perceive "time" like this. Hatebears and other prison style decks shouldn't perceive "time" as "turns" but rather as "how many spells can my opponent cast before he's dead?". If your opponent is completely locked out of ever casting another spell this game, it doesn't matter how fast or slow your clock is (think of the good old Stax decks that basically didn't even have a clock).
Yes, your opponent might be playing Repeal and Chain of Vapor but he doesn't have much "time" to find them because he can only play one spell a turn.