Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
: Burning Shield Askari gains first strike until end of turn.

First strike
, Discard a card: Burning-Fist Minotaur gets +2/+0 until end of turn.

Changeling (This card is every creature type.)
As long as a creature card with flying is in a graveyard, Cairn Wanderer has flying. The same is true for fear, first strike, double strike, deathtouch, haste, landwalk, lifelink, protection, reach, trample, shroud, and vigilance.

First strike (This creature deals combat damage before creatures without first strike.)
: Capashen Knight gets +1/+0 until end of turn.

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

First strike, haste
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

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.

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.)

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Flying, first strike
Enchanted creature gets +4/+4 and has flying and first strike.

Kicker and/or (You may pay an additional and/or as you cast this spell.)
If Cetavolver was kicked with its kicker, it enters the battlefield with two +1/+1 counters on it and with first strike.
If Cetavolver was kicked with its kicker, it enters the battlefield with a +1/+1 counter on it and with trample.

First strike
At the beginning of your upkeep, target opponent gains control of Chaos Lord if the number of permanents is even.
Chaos Lord can attack as though it had haste unless it entered the battlefield this turn.

Equipped creature has first strike, trample, and haste.
Equip

Whenever Chieftain en-Dal attacks, attacking creatures gain first strike until end of turn.

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Flying, first strike, vigilance, trample, lifelink
Enchanted creature gets +4/+4 and has flying, first strike, vigilance, trample, and lifelink.

Enchant creature
Enchanted creature gets +1/+0 for each Mountain you control and has first strike.

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

First strike

First strike
When Combustible Gearhulk enters the battlefield, target opponent may have you draw three cards. If the player doesn't, you mill three cards, then Combustible Gearhulk deals damage to that player equal to the total converted mana cost of those cards.

Enchant creature
Enchanted creature gets +2/+2 and has first strike and "Whenever this creature deals combat damage to a player, create a 1/1 white Human Soldier creature token."

At the beginning of each upkeep, creatures you control gain flying until end of turn if a creature you control has flying. The same is true for fear, first strike, double strike, landwalk, protection, trample, and vigilance.