Downright aggressive Goblin deck! Super fun to be playing!
Example of Turn 3 Win:
Turn 1: Play Land + Goblin Guide.
Attack with Goblin Guide for 2. End Turn. (Opponent at 18)
Turn 2: Play Land + Goblin Guide + Legion Loyalist.
Attack with Goblin Guide, Goblin Guide, and Legion Loyalist for 5. End Turn. (Opponent at 13)
Turn 3: Attack with Goblin Guide, Goblin Guide, and Legion Loyalist for 5.
Play Lightning Bolt + Goblin Grenade for 8 against opponent for game.
Example of Turn 4 Win:
Turn 1: Play Cavern of Souls + Foundry Street Denizen. End Turn.
Turn 2: Play Mountain + Warren Instigator.
Attack with Foundry Street Denizen for 2. End Turn. (Opponent at 18)
Turn 3: Play Mountain + Goblin Chieftain.
Attack with Foundry Street Denizen, Warren Instigator, and Goblin Chieftain.
During the First Strike phase, Warren Instigator will deal 2 damage. At that moment, play Krenko, Mob Boss from your hand and tap him for 4 goblin tokens. That will increase the power of Foundry Street Denizen by +5/0 during the combat phase.
When Warren Instigator deals 2 more damage during the combat phase, play Legion Loyalist from your hand to give your future tokens First Strike and Trample on Turn 4.
You will deal 13 damage - 2 damage from Goblin Chieftain, 4 damage from Warren Instigator, and 7 damage from Foundry Street Denizen. (Opponent at 5 life)
Turn 4: Tap Krenko, Mob Boss for 10 goblin tokens, and attack with the remaining 19 creatures.
Reminder: All creatures that attack will gain First Strike and Trample from Legion Loyalist. They will also receive +1/+1 and Haste from Goblin Chieftain.
Please Note: You could also win on turn 4 by using a Goblin Grenade. I just like swarming the board if I can :)
There are lots of different turn 4 and turn 3 combos that will win you the game that you can think of pretty easily yourself :)