After some plays i found out that Frenzied Goblin doesn't help that much, mainly because it doesn't have haste, i will keep him in Maybeboard/Sideboard because maybe it was just bad luck of the moment. I've putted 2x Stoke the Flames in his place because some games i reached a point that a spell with convoke dealing 4 damage would be more usefull than 3 goblins not being able to attack. Break Through the Line showed to be one of the main cards in this deck, but i'm keeping just two, because only one in battlefield is required. Magma Jet made this deck real faster. When i had Magma Jet in my hands i usually used it right away. Scry 2 made me sometimes send 2 lands to the bottom. That really helped.
SIDE BOARD:
In side board i putted things that would help me in some situations like Peak Eruption against other mono reds. Since this is a cheap deck we don't use fetch lands to reduce our lands in the draw, but other mono reds use, so Peak Eruption would sure make them slow because the lack of lands they usually put on themselves.
Kolaghan Forerunners is in side and i'm thinking to grab it to the mainboard, mainly beause of the trample. Some decks have creatures with high power and low defense, a trample there would make this deck day sometimes. But it's still in Sideboard because making creatures not able to block is working better.