DESCRIPTION
This deck is untested, but if it works, you can win in 3 turns (depending on what your opponent does).
Here's how:
Turn 1:
1. Mountain
2. Play Torch Courier
3. Hit for 1 (1 total damage)
Turn 2:
1. Mountain
2. Play Torch Courier
3. Hit for 2 (3 total damage)
4. Play Foundry Street Denizen
Turn 3:
1. Mountain
2. Play Skirk Prospector
3. Skirk gives Denizen +1 power (2 total)
4. Sacrifice one Torch Courier for mana
5. Play Krenko, Tin Streen Kingpin
6. Krenko gives Denizen +1 power (3 total)
7. Sacrifice other Torch Courier to give Krenko haste
5. Attack with Krenko and Denizen
a. Krenko gets +1/+1 Counter
b. Krenko creates 2 goblin tokens
c. Goblins give Denizen another +2 power (5 total)
d. Deal 7 damage (10 total damage)
6. Sacrifice token goblin for mana
7. Sacrifice other token goblin for Grenade cost
8. Goblin Grenade for 5 (15 total damage)
9. Sacrifice Denizen for mana
10. Sacrifice Prospector for Grenade cost
11. Goblin Grenade for 5 (20 total damage)
NOTE: TCG wouldn't allow me to enter Cavalcade of Calamity, but you could sub that in for Impact Tremors.