Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Smoke Teller 
Creature — Human Shaman · 2/2 · Common · Khans of Tarkir · #151
{1}{U}: Look at target face-down creature.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 151 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 20 September 2014You could target a creature you control with Smoke Teller’s ability, but there’s no benefit to doing so. Remember, you may look at face-down spells you control on the stack and face-down permanents you control at any time.
- 20 September 2014Smoke Teller’s ability lets you look at the creature as the ability resolves. It doesn’t let you look at it later, although you should be given a reasonable amount of time to look at it. In a multiplayer game, be sure not to reveal the card to other players.