Divine Sacrament

White creatures get +1/+1.
Threshold — White creatures get an additional +1/+1 as long as seven or more cards are in your graveyard.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Brave the Elements

Choose a color. White creatures you control gain protection from the chosen color until end of turn.

Sol Ring

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Celestial Crusader

Flash
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Flying
Other white creatures get +1/+1.

Arcane Signet

Crackdown

Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps.

Crusade

Honor of the Pure

Teysa, Orzhov Scion

Sacrifice three white creatures: Exile target creature.
Whenever another black creature you control dies, create a 1/1 white Spirit creature token with flying.

Paragon of New Dawns

Other white creatures you control get +1/+1.
{W}, {T}: Another target white creature you control gains vigilance until end of turn. (Attacking doesn't cause it to tap.)

Oros, the Avenger

Flying
Whenever Oros deals combat damage to a player, you may pay {2}{W}. If you do, Oros deals 3 damage to each nonwhite creature.

Savai Triome

({T}: Add {R}, {W}, or {B}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

Righteous War

White creatures you control have protection from black.
Black creatures you control have protection from white.

Crovax, Ascendant Hero

Other white creatures get +1/+1.
Nonwhite creatures get -1/-1.
Pay 2 life: Return Crovax to its owner's hand.