The real threat in my deck is not the Worldslayer, though it is my favorite card in this deck. I believe the real threat in my deck is the Student of warfare, which can be a 3/3 with first strike on Turn 2 if I pull him and 2 Plains in my opening hand. Having a first strike 3/3 on Turn 2 is very daunting against most decks. The Worldslayer is mainly just a kicker to wipe my opponent's creatures, artifacts and lands (my lands too) off the board. Because, hopefully, I have either 2 Exemplars or a Plate on one Exemplar, thus saving my knights from death and allowing me to attack virtually unchecked the next turn. One thing I have to worry about is Blue bounce spells. If I Worldslayer, but my Exemplar gets bounced all my creatures die as well. I think Blue could probably beat this deck pretty easy.
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Your deck seems to have okay rebound after Worldslayer. Your strategy assumes you have a Fresh Meat to throw out after Worldslayer, though. Your creature ratio is also kind of low. The Worldslayer, which seems to be your main card, is going to slowly deplete your mana base. You have indestructible creatures which will help mitigate that fact, but all the other spells you have will flood your hand until you are forced to discard. I would scale back on spells and up your creature content.