Until end of turn, creatures you control get +5/+5 and gain first strike, trample, and lifelink.

: Titanium Golem gains first strike until end of turn.

First strike, protection from red
When Tivadar of Thorn enters the battlefield, destroy target Goblin.

At the beginning of combat on your turn, if you control an artifact, Toolcraft Exemplar gets +2/+1 until end of turn. If you control three or more artifacts, it also gains first strike until end of turn.

Flying
Prevent all damage that would be dealt to Tresserhorn Skyknight by creatures with first strike.

Tribal Golem has trample as long as you control a Beast, haste as long as you control a Goblin, first strike as long as you control a Soldier, flying as long as you control a Wizard, and ": Regenerate Tribal Golem" as long as you control a Zombie.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Put a +1/+1 counter on target creature you control with the greatest power.
III — Target creature you control with the greatest power gains flying, first strike, and lifelink until end of turn.

Vigilance
: Truefire Paladin gets +2/+0 until end of turn.
: Truefire Paladin gains first strike until end of turn.

First strike, protection from legendary creatures
, : Destroy target legendary creature. It can't be regenerated.

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

First strike, haste
Equipped creature has first strike and haste.
Equip
Crew 1

Equipped creature gets +3/+3 and has first strike.
Whenever a creature dealt damage by equipped creature this turn dies, you may exile that card. If you do, create a 2/2 black Zombie creature token.
Equip

: Unyielding Krumar gains first strike until end of turn.

First strike
Creatures with swampwalk can be blocked as though they didn't have swampwalk.

: Add .
: Target creature loses first strike or swampwalk until end of turn.

: Urza's Avenger gets -1/-1 and gains your choice of banding, flying, first strike, or trample until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

: Roll a six-sided die. Urza's Science Fair Project gets the indicated result.
1 — It gets -2/-2 until end of turn.
2 — Prevent all combat damage it would deal this turn.
3 — It gains vigilance until end of turn.
4 — It gains first strike until end of turn.
5 — It gains flying until end of turn.
6 — It gets +2/+2 until end of turn.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flying, first strike
Whenever this creature mutates, you may cast target noncreature card with converted mana cost 3 or less from your graveyard without paying its mana cost.

First strike
As long as Valor is in your graveyard and you control a Plains, creatures you control have first strike.

First strike
Sacrifice Vampire Hexmage: Remove all counters from target permanent.