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Take out Goblin Rally and add one more Krenko's Command. Goblin Rally has a high mana cost and you will be using it only by turn 5. If you play correctly, in turn 5 the enemy should be defeated, so you will not need it. Also, two Krenko's Command is better than one Goblin Rally cause it is less atractive for a cancel ou other counter-magic.
Also, in goblin decks you need more creatures. The aim is to defeat the player by turn 5. After that the chances of win decrease as the other player will have mana for more powerful spells.
check out my goblin deck, if you have some tips for me too I will be glady: deck:throw-goblins-at-then