I will let you know right now, this deck will not work in anything resembling a Modern meta.
Spoiler: mono-red burn
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Creatures
4x Monastery Swiftspear
4x Goblin Guide
4x Eidolon of the Great Revel
2x Chandra's incinerator
Spells
4x Lava Spike
4x Lightning Bolt
4x Skewer the Critics
4x Skullcrack
4X Rift Bolt
2x Searing Blaze
Enchantments
4x Seal of Fire
Lands
16x Mountain
4x Ramunap Ruins
This isn't an especially great version of burn, but can be built for ~$100. I'm not sure what your deck would be able to do about this one simply outrunning you.
If you want to get into Magic for less than $100, try to convince your store to run pauper, or commander. Any of the traditional 60 card formats will be basically impossible to get into cheaply.