Do not take out chain lightnings. They are just too good being 3 for 1. I would cut the cursed scrolls for 2 rancors. In an aggresive deck, scroll is just too slow when you want to be playing threats and burning the other player out. If I would ever make this deck, it would go like this.

Lands
4 Wasteland
4 Wooded Foothills
2 Bloodstained Mire
4 Taiga
5 Mountain
1 Forest

Creatures
4 Grim Lavamancer
4 Kird Ape
4 Mogg Fanatic
4 Tarmogoyf
4 Scab-Clan Mauler

Instants:
4 Fireblast
4 Incinerate
4 Lightning Bolt
4 Seal of Fire

Sorceries:
4 Chain Lightning

Sideboard:
3 Krosan Grip
4 Pyroblast
4 REB
4 Umezawa's Jitte