Chaos Wins!

Goblins has been a popular tribal deck in any format since the early days of sligh. The tribe was considered underpowered however until Onslaught block was released and the Scourge set specifically catapulting a once marginal tribe into one of the most powerful.

I basically lifted the below list straight from an extended season way back in 2003. The original deck was coined Gob-vantage. It combined the deck stacking ability of Goblin Recruiter with the card drawing power of Goblin Ringleader that led to explosive combos of hasted Goblin Piledrivers attacking for well over 20 damage all in one turn.

Goblins - Classic Tribal Wars

Creatures

4 Goblin Lackey
3 Mogg Fanatic
3 Skirk Prospector
4 Goblin Piledriver
4 Goblin Recruiter
1 Sparksmith
3 Gempalm Incinerator
3 Goblin Warchief
2 Goblin Matron
1 Goblin Sharpshooter
3 Goblin Ringleader
2 Siege Gang Commander
1 Goblin Assassin

Spells

3 Rites of Initiation

Land

10 Mountain
2 Goblin Burrows
2 Wasteland
2 Bloodstained Mire
4 Wooded Foothills
1 Pendelhaven
2 Ancient Tomb

The combo is outlined in the linked article. The paragraph explaining it is here:

"Turn two Goblin Recruiter puts the following cards on top of your library: Goblin Warchief, Goblin Ringleader, Skirk Prospector and three Piledrivers. You draw and play the Warchief and on the next turn you play your Ringleader and put the Skirk Prospector and three Piledrivers in your hand. With the remaining mana you cast a Prospector and sacrifice your Ringleader, Recruiter and Prospector to cast all three Piledrivers and attack for the win."

Gob-vantage was a solid deck back then in Extended and in Classic Tribal Wars almost nothing changes. The vast majority of goblins hasn't really improved since then with apologies to beaters Warren Instigator and Goblin Chieftain. The cards in this version are basically the same with some sideboard concessions main-decked since card swapping isn't allowed in Tribal. I moved the Assassin and Sharpshooter into the main deck and added some sac lands, landkill and a Pendelhaven.

Gob-vantage is arguably the most potent tribal deck in the format right now. It has all the tools to win, and it can also do it very quickly with the ability to reduce an opponent with a significant life and board advantage to zero in a single turn.