Double strike

Whenever Arashin Foremost enters the battlefield or attacks, another target Warrior creature you control gains double strike until end of turn.

{T}: Add {W}.

Haste

{T}: Add one mana of any color. Spend this mana only to cast a creature spell.

Flying

{T}: Add one mana of any color.

{T}, Pay 1 life: Add {G}.

{T}: For each color among permanents you control, add one mana of that color.

{1}, {T}: Add {R}{W}.

Double strike

Whenever Bruse Tarl, Boorish Herder enters the battlefield or attacks, target creature you control gains double strike and lifelink until end of turn.

Partner (You can have two commanders if both have partner.)

Coldsteel Heart enters the battlefield tapped.

As Coldsteel Heart enters the battlefield, choose a color.

{T}: Add one mana of the chosen color.

Double strike

When Crypt Champion enters the battlefield, each player puts a creature card with mana value 3 or less from their graveyard onto the battlefield.

When Crypt Champion enters the battlefield, sacrifice it unless {R} was spent to cast it.

{T}: Add {B} or {G}.

Delirium -- Deathcap Cultivator has deathtouch as long as there are four or more card types among cards in your graveyard.

{T}: Exile target land card from a graveyard. Add one mana of any color.

{B}, {T}: Exile target instant or sorcery card from a graveyard. Each opponent loses 2 life.

{G}, {T}: Exile target creature card from a graveyard. You gain 2 life.

{T}: Add {G}.

Put a -1/-1 counter on Devoted Druid: Untap Devoted Druid.

{T}: Add {R}, {G}, or {W}.

{T}: Add {B}. Elves of Deep Shadow deals 1 damage to you.

Double strike

Heroic -- Whenever you cast a spell that targets Fabled Hero, put a +1/+1 counter on Fabled Hero.

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

Double strike

{T}: Add {G}.

All Slivers have "{T}: Add one mana of any color."

Bestow {5}{W} (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.)

Double strike (This creature deals both first-strike and regular combat damage.)

Enchanted creature gets +1/+1 and has double strike.

{1}, {T}: Add {B}{G}.

{1}, {T}: Add {R}{G}.

{T}: Add X mana of any one color, where X is the number of Allies you control.

{T}: Add one mana of any color that a land you control could produce.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

As long as Honored Hierarch is renowned, it has vigilance and "{T}: Add one mana of any color."

Double strike

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Double strike (This creature deals both first-strike and regular combat damage.)

Double strike, vigilance

Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter.

Kalemne, Disciple of Iroas gets +1/+1 for each experience counter you have.

{T}: Add {B}.

{T}: Add {G}.

Landfall -- Whenever a land enters the battlefield under your control, add one mana of any color.

Sliver creatures you control have "{T}: Add one mana of any color."

Double strike

Double strike

Whenever Markov Blademaster deals combat damage to a player, put a +1/+1 counter on it.

Double strike, protection from black and from green

At the beginning of each combat, creatures you control gain first strike until end of turn if a creature you control has first strike. The same is true for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, skulk, trample, and vigilance.

Battalion -- Whenever Ordruun Veteran and at least two other creatures attack, Ordruun Veteran gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

{1}, {T}: Add {W}{B}.

{T}: Add {G} for each Elf on the battlefield.

Double strike, trample

Whenever Prophetic Flamespeaker deals combat damage to a player, exile the top card of your library. You may play it this turn.

As Quirion Elves enters the battlefield, choose a color.

{T}: Add {G}.

{T}: Add one mana of the chosen color.

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

Whenever Radha, Heir to Keld attacks, you may add {R}{R}.

{T}: Add {G}.

When Rageform enters the battlefield, it becomes an Aura with enchant creature. Manifest the top card of your library and attach Rageform to it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Enchanted creature has double strike. (It deals both first-strike and regular combat damage.)

{1}, {T}: Add {B}{R}.

Vigilance, haste

As Saskia the Unyielding enters the battlefield, choose a player.

Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Double strike

Savageborn Hydra enters the battlefield with X +1/+1 counters on it.

{1}{R/G}: Put a +1/+1 counter on Savageborn Hydra. Activate only as a sorcery.

{T}: Add {G}.

At the beginning of each upkeep, if no spells were cast last turn, transform Scorned Villager.

Vigilance

{T}: Add {G}{G}.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Moonscarred Werewolf.

{1}, {T}: Add {G}{W}.

When Servant of the Conduit enters the battlefield, you get {E}{E} (two energy counters).

{T}, Pay {E}: Add one mana of any color.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Silverblade Paladin is paired with another creature, both creatures have double strike.

{T}: Add {G}.

{1}: Add {R} or {W}.

Flying

Double strike (This creature deals both first-strike and regular combat damage.)

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

If a creature card with flying was exiled with Soulflayer's delve ability, Soulflayer has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance.

Sphere of the Suns enters the battlefield tapped and with three charge counters on it.

{T}, Remove a charge counter from Sphere of the Suns: Add one mana of any color.

Vigilance

{T}: Add {G}.

Defender, hexproof

{T}: Add one mana of any color.

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

{T}: Add {C}.

{T}: Add {R} or {G}. Talisman of Impulse deals 1 damage to you.

{T}: Add {C}.

{T}: Add {B} or {R}. Talisman of Indulgence deals 1 damage to you.

{T}: Add {C}.

{T}: Add {G} or {W}. Talisman of Unity deals 1 damage to you.

Defender

{T}: Add {G}.

{5}{G}{G}: Transform Ulvenwald Captive.

{T}: Add {C}{C}.

{T}: Add one mana of any color.

{T}: Add {G}.

Threshold -- Werebear gets +3/+3 as long as seven or more cards are in your graveyard.

Double strike

Bloodrush -- {3}{R}{R}, Discard Wrecking Ogre: Target attacking creature gets +3/+3 and gains double strike until end of turn.

{T}: Add {G}.

Whenever you tap Zhur-Taa Druid for mana, it deals 1 damage to each opponent.