"I will follow the light of Iona into battle, and I will know no fear."

Ondu War Cleric

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

The List

Oath of the Gatewatch

To activate a cohort ability, the Ally with that ability must have been under your control continuously since the beginning of your most recent turn. Informally, it can’t have “summoning sickness.” However, the other Ally you tap can be one that just came under your control. (Note that tapping the second Ally doesn’t use {T} [the tap symbol].)