Guided Strike

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

Battlefield Raptor

Benalish Knight

Flash (You may cast this spell any time you could cast an instant.)
First strike (This creature deals combat damage before creatures without first strike.)

Bold Defense

Kicker {3}{W} (You may pay an additional {3}{W} as you cast this spell.)
Creatures you control get +1/+1 until end of turn. If this spell was kicked, instead creatures you control get +2/+2 and gain first strike until end of turn.

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

Battlefield Promotion

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn. You gain 2 life.

Mosquito Guard

First strike
Reinforce 1—{1}{W} ({1}{W}, Discard this card: Put a +1/+1 counter on target creature.)

Hand of Enlightenment

Era of Enlightenment

(As this Saga enters and after your draw step, add a lore counter.)
I — Scry 2.
II — You gain 2 life.
III — Exile this Saga, then return it to the battlefield transformed under your control.

Era of Enlightenment // Hand of Enlightenment

Enchant creature
Enchanted creature gets +2/+2, has first strike, and is a Knight in addition to its other types. (It deals combat damage before creatures without first strike.)

Eagles of the North

Flying
When Eagles of the North enters the battlefield, creatures you control get +1/+0 and gain first strike until end of turn.
Plainscycling {1} ({1}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.)

Kjeldoran Gargoyle

Flying, first strike
Whenever Kjeldoran Gargoyle deals damage, you gain that much life.

Arcane Signet

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

Ballynock Cohort

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

Cartouche of Solidarity

Enchant creature you control
When Cartouche of Solidarity enters the battlefield, create a 1/1 white Warrior creature token with vigilance.
Enchanted creature gets +1/+1 and has first strike.

Attended Knight

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

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.)

Duelist of Deep Faith

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
As long as it's your turn, Duelist of Deep Faith has first strike.

Bladed Pinions

Equipped creature has flying and first strike.
Equip {2}

Kwende, Pride of Femeref

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

Encampment Keeper

First strike
{7}{W}, {T}, Sacrifice Encampment Keeper: Creatures you control get +2/+2 until end of turn.

Benalish Lancer

Kicker {2}{W} (You may pay an additional {2}{W} as you cast this spell.)
If Benalish Lancer was kicked, it enters the battlefield with two +1/+1 counters on it and with first strike.

Gempalm Avenger

Cycling {2}{W} ({2}{W}, Discard this card: Draw a card.)
When you cycle Gempalm Avenger, Soldier creatures get +1/+1 and gain first strike until end of turn.

Cloud Crusader

Flying
First strike (This creature deals combat damage before creatures without first strike.)

Ethereal Armor

Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control and has first strike.

Jousting Lance

Equipped creature gets +2/+0.
As long as it's your turn, equipped creature has first strike.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Asha's Favor

Enchant creature
Enchanted creature has flying, first strike, and vigilance.

Helica Glider

Helica Glider enters the battlefield with your choice of a flying counter or a first strike counter on it.

Cavalry Drillmaster

When Cavalry Drillmaster enters the battlefield, target creature gets +2/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)