Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Akoum Flameseeker 
Creature — Human Shaman Ally · 3/2 · Common · Oath of the Gatewatch · #101
Cohort — {T}, Tap an untapped Ally you control: Discard a card. If you do, draw a card.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 101 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 22 January 2016To 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].)
- 22 January 2016Discarding a card is part of the ability’s effect and isn’t optional. As the cohort ability resolves, if you have a card in your hand, you must discard one, even if the card you may have wanted to discard as you activated the ability is no longer in your hand.