Shelter

Target creature you control gains protection from the color of your choice until end of turn.
Draw a card.

Kwende, Pride of Femeref

Double strike
Creatures you control with first strike have double strike.

Guided Strike

Target creature gets +1/+0 and gains first strike until end of turn.
Draw a card.

Warded Battlements

Defender (This creature can't attack.)
Attacking creatures you control get +1/+0.

Attended Knight

First strike
When Attended Knight enters, create a 1/1 white Soldier creature token.

Caravan Escort

Level up {2} ({2}: Put a level counter on this. Level up only as a sorcery.)
LEVEL 1-4
2/2
LEVEL 5+
5/5
First strike

Porcelain Legionnaire

({W/P} can be paid with either {W} or 2 life.)
First strike

Ballynock Cohort

First strike
Ballynock Cohort gets +1/+1 as long as you control another white creature.

Guardians' Pledge

White creatures you control get +2/+2 until end of turn.

Soltari Lancer

Shadow (This creature can block or be blocked by only creatures with shadow.)
Soltari Lancer has first strike as long as it's attacking.

Knight of Dawn

First strike
{W}{W}: Knight of Dawn gains protection from the color of your choice until end of turn.

Lightning Blow

Target creature gains first strike until end of turn.
Draw a card at the beginning of the next turn's upkeep.

Hyena Umbra

Enchant creature
Enchanted creature gets +1/+1 and has first strike.
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Pegasus Charger

Flying (This creature can't be blocked except by creatures with flying or reach.)
First strike (This creature deals combat damage before creatures without first strike.)