Grand Melée Deck

I'm going to play a Grand Melée tournament on the 13th, and I'm wondering if
anyone can help me.

4 Incinerate
4 Slith Firewalker
4 Steel Wall
3 Great Furnace
4 Spark Spray
4 Iron Myr
3 Isochron Scepter
3 War Elemental
2 Shrapnel Blast
4 Tanglebloom
20 Mountain
4 Arc Lightning
3 Thought Prison
4 Goblin Replica
2 Pyrite Spellbomb
2 Flamewave Invoker
---

And I'm thinking of using...

4 Molten Rain
4 Alpha Myr
3 Cloudpost
3 Earthquake
3 Welding Jar
3 Ark of Blight

Hope anyone can help me.

Signed
Simon W

P.S. Don't take out the War Elementals!