Combo Setup

1 [optional]. Pandaren Importer grab Shadowstep and do so. It's now 1 mana.

2. Shroud of Concealment + Vicious Slitherspear

3. Next turn, play Brann Bronzebeard + Mailbox Dancer + Pandaren Importer = 2x Coin + 2x Shadowstep

For option 1:

Shadowstep Mailbox Dancer and Pandaren Importer and play them.

If you want to avoid errors in locking yourself out of a combo, you could always grab two shadowsteps:

Total damage = 1 + 4 damage per 6 card cycle (mailbox + pandaren + 2 coins + 2 shadowsteps)

that means 48 cards for 33 damage

For option 2:

alternate grabbing 2x Shadowstep with 1x Shadowstep and 1x Sinister strike.

Total damage = 1 + 11 damage per 12 card cycle (mailbox + pandaren + 2 coins + 2 shadowsteps, followed by mailbox + pandaren + 2 coins + 1 shadowstep + 1 sinister strike.

that means 36 cards for 34 damage. But easier to mess up.

Notes:

(Play Coin while waiting for Shadowstep animations.)

If you draw Vicious Slitherspear without Shroud of Concealment, shuffle it back in with Sir Finley, Sea Guide.