Note: Leeroy Jenkins has been changed to 5 mana. Since this balance change greatly affects Miracle Rogue's viability and design as a whole, I'll be leaving this answer as a historical tribute to the deck. All information in this answer is no longer applicable!
The main damage cards of Miracle Rogue are Leeroy Jenkins (4 Mana, 6 damage), Eviscerate (2 mana, 4 damage only as second card or later), Cold Blood (1 mana, 4 damage, only after Leeroy) and Shadowstep (2 mana, 6 damage, only after Leeroy). Preparation can be used to play a free Eviscerate or Cold Blood, I will include this option as additional damage in the following list as it's rather unlikely.
I'll split this up by mana, starting at 6 because less is really not that relevant, the fun in miracle rogue really only begins around turn 5 with the Auctioneer. Not including turn 5 itself because all the mana goes into Auctioneer there. Be wary of the Coin!
Note that in most cases, there will be an auctioneer on the field who does 4 additional damage. I won't include this damage in the list because it may or may not actually be there if you get rid of it in time.
6 Mana
- Leeroy Jenkins + Eviscerate for 10 damage
- Leeroy Jenkins + Shadowstep for 12 damage
- Any of the above + up to 2 of Preparation + Cold Blood for +4 or +8 damage
- Leeroy Jenkins + 2x Cold Blood for 14 damage
- Any of the above + up to 2 of Preparation + Eviscerate for +4 or +8 damage
7 Mana
- Leeroy Jenkins + Eviscerate + Cold Blood for 14 damage
- Leeroy Jenkins + Shadowstep + Cold Blood for 16 damage
- Any of the above + Preparation + Cold Blood for +4 damage
- Any of the above + up to 2 of Preparation + Eviscerate for +4 or +8 damage
8 Mana
- Leeroy Jenkins + 2x Eviscerate for 14 damage
- Leeroy Jenkins + Shadowstep + Eviscerate for 16 damage
- Leeroy Jenkins + 2x Shadowstep for 18 damage
- Any of the above + up to 2 of Preparation + Cold Blood for +4 or +8 damage
- Leeroy Jenkins + Eviscerate + 2x Cold Blood for 18 damage
- Leeroy Jenkins + Shadowstep + 2x Cold Blood for 20 damage
- Any of the above + up to 2 of Preparation + Eviscerate for +4 or +8 damage
9 Mana
- Leeroy Jenkins + 2x Eviscerate + Cold Blood for 18 damage
- Leeroy Jenkins + Shadowstep + Eviscerate + Cold Blood for 20 damage
- Leeroy Jenkins + 2x Shadowstep + Cold Blood for 22 damage
- Any of the above + Preparation + Cold Blood for +4 damage
- Any of the above + up to 2 of Preparation + Eviscerate for +4 or +8 damage
10 Mana
- Leeroy Jenkins + Shadowstep + 2x Eviscerate for 20 damage
- Leeroy Jenkins + 2x Eviscerate + 2x Cold Blood for 22 damage
- Leeroy Jenkins + 2x Shadowstep + Eviscerate for 22 damage
- Leeroy Jenkins + Shadowstep + Eviscerate + 2x Cold Blood for 24 damage
- Leeroy Jenkins + 2x Shadowstep + 2x Cold Blood for 26 damage
- Any of the above + up to 2 of Preparation + Cold Blood for +4 or +8 damage
- Any of the above + up to 2 of Preparation + Eviscerate for +4 or +8 damage
11 Mana (Coin)
- Leeroy Jenkins + Shadowstep + 2x Eviscerate + Cold Blood for 24 damage
- Leeroy Jenkins + 2x Shadowstep + Eviscerate + Cold Blood for 26 damage
- Any of the above + Preparation + Cold Blood for +4 damage
- Any of the above + Preparation + Eviscerate for +4 damage