THIS DECK IS LEGEND VIABLE*
I'm deviating from the current Aggro Pally build to try out Invigorating Sermon and Cariel Roame, and I must say that if your Call to Arms minions stick, the subsequent turn with board buffs is quite good. Because you can buff your hand and deck as well, I think that Nerubian Egg can find a spot here.
My main objective is to make Sermon useful, so I mainly use Keeper of Uldaman and Sunkeeper Tarim as removal for big threats, and since I'm trying to make use of board buffs, I'm also experimenting with Silvermoon Portal, to always have at least two minions in play (plus, it can be discounted by Cariel, which is what made me include it).
It might turn out that the meta requires Far Watch Post to be played on this kind of deck, but I really want all my minions to be able to attack. And always remember to cast First Day of School before buffing your hand.
I hit Legend with this homebrew deck. Climbed all the way from Diamond 10 to Diamond 1 using it. Had a winstreak of 8-0 from D3 to D1, where I fell off to D2, only to go back and claim my place at Legend later on. Admittedly, I have no way to prove it, I don't use any trackers or services, but I'm just happy that it worked so well, and honestly just want to share this happiness with more people.
One important thing that I want to point out is how much of an MVP Knife Juggler is. If you want to succeed with this deck, you better learn how to use him properly and not to just throw him at the board. He saved me from many losses, and since the opponent is not expecting you to drop one, once he's down they'll rush to kill it at any cost. Once you've mastered the art of knife juggling, you'll be ready to pilot the deck.
One last thing, you might want to swap the legendaries for tech cards depending on the meta, although Cariel Roame is excellent as both removal and tempo, so if you have her I'd suggest keeping her in. Sunkeeper Tarim is, like I've said, more of a controlling tool, so that in itself is a good tech too.
If you decide to give this creation of mine a try I'd be very happy, and I wish you good luck!