I see you're looking for cheaper options, so I'm going to suggest the most budget options I think will help.
Oreskos Explorer/Kor Cartographer - Along with the Knight you already play, two of the few other creatures that put lands directly into play for W. Explorer gives you another early drop.
Inheritance - A pet card of mine that I like more than Armistice.
Vengeful Dreams - Very cheap exile removal, with the added bonus of dropping Gisela or another target in your graveyard.
Paragon of New Dawns/Spear of Heliod - You have a lot of token makers that Always Watching does not benefit. Paragon boosts everything and is a human that can attacl and be pulled back by your commander, and the Spear can boots everything, destroy a creature, and returns with Emeria/Titan. Or you can go maximum flavour and use Angelic Voices.
Angel of Glory's Rise - You're running a good amount of humans and she can bring them all back. I'd run her over Konda in at 7 mana. And if you do run this angel you can look into all sorts of silly combos with Fiend Hunter, a sac outlet like Reaper of Flight Moonsilver, and: Reliquary Monk to destroy all enchantments or artifacts
Mardu Woe-Reaper to clear all creatures from graveyards and gain life
Mardu Hordechief to, if you attacked this turn, make infinite creatures
Quote from JDviant »Looks like solid changes all around. I'm guessing removing Sun Titan has worked out?