So it's a casual deck.

Not legacy

didnt see that was an option. its been changed, thanks for the subtle comment.

yeah no problem man

i like mono white decks

Well unless you can target Fabled Hero with some sort of spell, he kind of sucks. He really isn't for you deck since you don't really have any instants/sorcery/enchantments to target him for his heroic ability.

I think some cards you could consider replacing are Elite Inquisitor . You could put inn Precinct Captain instead. He has first strike and a way better ability. Maybe add in Heliod, God of the Sun too. He's perfect for mono white, and you have a lot of good devotion cards going on. I think you should main board Banisher Priest . I'd take out all the Fabled Hero and 1 Adaptive Automaton .

Fiendslayer Paladin is a good sideboard card.

I really like the idea of Ghostway and Wrath of God . The only problem is, are you going to have that 7 mana available to use the combo? If you notice you're having mana problems you should think about adding in Nykthos, Shrine to Nyx . I mean you definitely will have some stinking good devotion going on.

oh no, sorry to be clear Ghostway is in order to get around sweepers, not to play my own sweeper then bring them back.

Cathedral of War has certainly helped in my human deck, and you may as well get 4 because you are only running one color and shouldn't have trouble getting white mana out. That's the beauty of mono-colored decks, you can have cool lands and not worry about it.