Just imagine bieng able to have 3-5 creatures out in two turns with only two mana.
1st turn:mountain,lackey
2nd turn:another mountain, attack, Boom! goblin marshall/w 2more creatures,and if you have a goblin grenade, sac the marshall for 5damage and 3 more creatures
3rd turn: another mountain, goblin king,attack for 6, and if lackey is not blocked, then pull out another marshall and two more creatures and destroy opponent next turn!!