MTG Salvation

I'm pretty new to the game and my friends helped me to build a red/ green deck and it doesn't seem bad until i actually try to battle with someone. Can someone give me help/criticism?

Spells (10)--------------------- Creatures (26)- 1x Goblin Shortcutter
1x Bear Umbra--------------------- 1x Goblin Bushwhacker
1x Quest for Renewal ----------------------- 2x Conquering Manticore
1x Lightning Bolt--------------------- 2x Raging Goblin
1x Traitorous Instinct--------------------- 1x Lightning Element
1x Searing Blaze--------------------- 1x Greenweaver Druid
1x Giant Growth-------------------- 2x Sporecap Spider
1x Flame Slash--------------------- 2x KilnFeind
1x Explore--------------------- 1x Rage Nimbus
1x Act of Treason------------------- 4x Arbor Elf
1x Flame Break--------------------- 1x Daggerback Basilisk
--------------------- 1x Baloth Woodcrasher
--------------------- 2x Omnath, Locus of Mana
--------------------- 1x Toxic Iguanar
--------------------- 1x Plated Slagwurm
--------------------- 1x Mul Daya Channelers
--------------------- 1x Pelakka Wurm
--------------------- 1x Rampaging Baloths