The bane of white-blue decks in that format was Cabal Torturer, and without Psionic Gift, the only good way to deal with this creature was to splash red or black as a third color, weakening your mana base
We can run Danitha, Benalias Hope lines, sneaking in Ardenn, Intrepid Archaeologist (a Kor Scout)
Lorehold Spirit (RW): Leverage your graveyard to summon Spirits and grow your army with powerful synergies
Nesting Bot is in Standard right now, for example, and makes this look incredibly weak by comparison
Decklist The deck consists of 26 creatures, 11 sorceries, seven instants, 11 artifacts, ten enchantments, and 34 lands
While rules or guidelines can be helpful, I dont believe there is a single set of rules to be followed