3. Goblin Barrel

The goblin barrel is the quickest counter attack card in the game. Instead of having to march or fly to a tower, the goblin barrel is launched through the air for a mere 3 elixir. This fast ability is a perfect way to punish your opponent for playing a high elixir card. The goblin barrel also carved a path for cards with similar abilities such as the miner and graveyard. On top of that, it is one of the first cards any player receives in the game, so most players have used it at some point.