If you play DoC exactly on 5 (or 4 with coin) without drawing any key cards first, then yes, it's awesome. If you don't though, you just play a bad deck. So yeah... no.
In my opinion, this card could work for like 2-3 mana, because then you could play it in regular Control Lock as an additional win condition, aiming to buff 7-10 minions from your deck, that you would play anyway, even without DoC. You managed to pull it off? Good for you. You didn't? Shame, but you still have a good, viable deck, so no big deal. For 4-5 mana it's still too terrible.
Deck of Chaos is still a meme card. Even if you get the buff early, you run out of steam against control decks, like infinite board removal mill warlocks or endless value generating priests. Against aggro decks you usually just die before getting value from DoC.
Maybe experiment making room for bloodbloom for turn 3 with coin and turn 4 without. And plot twist might increase the odds of being able to draw and play DOC on curve. Plot twist also let's you shuffle back unbuffed minions and draw the buffed ones.
Even at 4 mana might cost you a full turn doing nothing to play it, which usually means death against aggro decks. Deck of Lunacy is not played for this reason any more. Like Lunacy Deck of Chaos does not buff your hand, you need to draw your advantage, which might be too slow after turn 4-6 (which already requires a lot of luck).