Devin des fumerolles

You 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.

Smoke 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.