Trained Caracal

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Invigorating Surge

Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature.

Forced Adaptation

Enchant creature
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.

Auriok Champion

Protection from black and from red
Whenever another creature enters, you may gain 1 life.

Bess, Soul Nourisher

Whenever one or more other creatures you control with base power and toughness 1/1 enter, put a +1/+1 counter on Bess, Soul Nourisher.
Whenever Bess attacks, each other creature you control with base power and toughness 1/1 gets +X/+X until end of turn, where X is the number of +1/+1 counters on Bess.

Keleth, Sunmane Familiar

Whenever a commander you control attacks, put a +1/+1 counter on it.
Partner (You can have two commanders if both have partner.)

Fencing Ace

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

Suntail Hawk

Arcane Signet

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

Sunpetal Grove

Sunpetal Grove enters tapped unless you control a Forest or a Plains.
{T}: Add {G} or {W}.

Segovian Angel

Luminarch Aspirant

At the beginning of combat on your turn, put a +1/+1 counter on target creature you control.

Plains

Kitesail Scout

Defiant Elf

Copperhorn Scout

Whenever Copperhorn Scout attacks, untap each other creature you control.

Adorned Pouncer

Double strike
Eternalize {3}{W}{W} ({3}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Cat with no mana cost. Eternalize only as a sorcery.)

Grateful Apparition

Flying
Whenever Grateful Apparition deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Lantern Kami

Kor Blademaster

Double strike
Equipped Warriors you control have double strike.

Scryb Sprites

Hydra's Growth

Enchant creature
When Hydra's Growth enters, put a +1/+1 counter on enchanted creature.
At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

Sacred Cat

Lifelink
Embalm {W} ({W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie Cat with no mana cost. Embalm only as a sorcery.)

Jawbone Duelist

Double strike
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Charging Badger

Greatsword of Tyr

Whenever equipped creature attacks, put a +1/+1 counter on it and tap up to one target creature defending player controls.
Equip {W} ({W}: Attach to target creature you control. Equip only as a sorcery.)

Court Cleric

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Court Cleric gets +1/+1 as long as you control an Ajani planeswalker.

Command Tower

Savannah

Healer's Hawk

Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Aven Skirmisher

Essence Warden

Whenever another creature enters, you gain 1 life.

Beloved Princess

Lifelink
Beloved Princess can't be blocked by creatures with power 3 or greater.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Forest

Visions of Dominance

Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it.
Flashback {8}{G}{G}. This spell costs {X} less to cast this way, where X is the greatest mana value of a commander you own on the battlefield or in the command zone. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Hardened Scales

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.