Based upon the early testing, I feel this is what Secret Paladin may look like.  I feel like you always want to mulligan away your Secrets and search for Sword of the Fallen.  Knight of Anointment is a solid keep to thin out your deck.  There are 6 Holy Spells in the deck and only 2 are Secrets.  Horde Operative is mostly in here as a tech card against other Secret Paladins as I'm guessing it will be a fairly common class in the first few weeks of play.  If Secret decks drop off, you could replace it with another copy of Galloping Savior or another tech card that might be more useful.

While the deck is fairly budget, there are two legendary cards.  I feel they're core for the deck to be viable, but if you feel there are budget options available that could be reasonably comparable feel free to drop a comment.