MTG Salvation

Hello all,
I'm new to these forums and recently returned to Magic after a few years' hiatus. I'm trying to get back into Modern and have always loved Goblins, so I've started to put an 8-whack deck together. (I know it's not extremely competitive in today's modern). Below is my current list. I have about $60 to upgrade and am open to suggestions! : D

8 Whack
Mainboard
Creatures
4 Legion Loyalist
4 Goblin Guide (missing 1)
4 Burning-Tree Emissary
4 Reckless Bushwhacker
4 Goblin Bushwhacker
4 Foundry Street Denizen
4 Goblin Piledriver
4 Mogg War Marshal
Other Spells
3 Light Up the Stage (missing 3, considering Risk Factor instead)
4 Lightning Bolt
Lands
4 Ramunap Ruins
15 Mountains

Sideboard (missing everything but the Chainwhirlers)
4 Skullcrack
2 Smash to Smithereens
3 Dragon’s Claw
3 Goblin Chainwhirler
2 The Flame of Keld
1 Blood Moon

I prefer Goblin Grenade over Light up the Stage (LutS) in 8-Whack. LutS can flip a bushwhacker which is a lot of damage, but usually will hit a 1/1 and a land. Grenade is usually 5 damage except if you are out of goblins after overextending into a boardwipe, something you can play around, and is more consistently a larger source of damage.

I have also cut Goblin Piledriver for more impactful creatures like Goblin Chieftain and Goblin Rabblemaster. I found that my Piledrivers kept getting chumped, so I tried to find creatures that do more than just attack well. I'm currently running 3 Chieftain in the Piledriver slot.

My list: