The List

Creature — Human Cleric Ally

Cohort — {T}, Tap an untapped Ally you control: You gain 2 life.

Ondu War Cleric

Creature — Human Shaman Ally

Cohort — {T}, Tap an untapped Ally you control: Target opponent loses 2 life.

Zulaport Chainmage

Creature — Goblin Archer Ally

First strike
Cohort — {T}, Tap an untapped Ally you control: This creature deals 1 damage to target opponent or planeswalker.

Zada's Commando

Oath of the Gatewatch Promos

Creature — Kor Knight Ally

Cohort — {T}, Tap an untapped Ally you control: Put a +1/+1 counter on each creature you control.

Munda's Vanguard

Zombie

Creature — Vampire Shaman Ally

Cohort — {T}, Tap an untapped Ally you control: Create a tapped 2/2 black Zombie creature token.

Drana's Chosen

Oath of the Gatewatch

Creature — Human Wizard Ally

Cohort — {T}, Tap an untapped Ally you control: Tap target creature.

Spawnbinder Mage

Creature — Kor Artificer Ally

Cohort — {T}, Tap an untapped Ally you control: Look at the top four cards of your library. You may reveal an Equipment card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Stoneforge Acolyte

Cohort — {T}, Tap an untapped Ally you control: You draw a card and you lose 1 life.

Malakir Soothsayer

Cohort — {T}, Tap an untapped Ally you control: Discard a card. If you do, draw a card.