You use Chaos Wrap to remove a creature and your opponent may recive a better creature or a planeswalker. Do you need an unconditional permanent removal? This deck may use White and Black cards, you may use
Vindicate, same CMC, destroys any permanent (including lands), and you don't give your opponent anything. I have won matches only because my opponent used a Chaos Wrap and give me a win condition. So no, Chaos Wrap is not a good card.
I agree that
Hellkite Tyrant is a good creature, but there are better creatures (because this dragon is more about other kind of deck) and it is necessary reduce the number of cards. If you have no problem to include new cards, it's a good card, but if you need to cut some cards, there are better things in the deck.
Sower of Discord is very powerfull? Are you serious? This card is as bad that it should be uncommon or even common. 6/6 flying that cost 4BB. Not very good, there are better creatures. Oh, but it has an ability, we should analize it. If you play 1 Vs 1, it's nearly unplayable because you must choose yourself, so every time you damage your opponent, you will loose the same life. Ok, think about you are playing aganist 2 other players. So, you have 2 opponents, and you choose them to the ability. Then the ability is even worse, everytime each your opponents damages the other opponent, they will loose the same amount of life, so what do you think that are going to happen? Your two opponents will attack you and only you, because if they attacks the other player, they will loose life, and if they attack you, they won't loose life.