Ok so ive been running a very similar RDW with great success, i used it for a couple of nights to easily gain about 30 ranks on steam (which i know is a **** rank system, but i still think this type of deck is an easy rank farm).

It trades mana consistency (16 land) for some very awesome top decking, i only run 2 cards requiring 3 mana. and ive won multiple games with just 1 land, but obviously 2 land is the sweet spot.

The key is to mulligan for a minimum 2 land hand, the only exception being a satyr + furor + furor + shock etc. type draw on the play. Also if you draw a 4-5 land hand, you can still do quite well, the top decks are almost always more gas. The DotP first free mulligan really helps this approach, so make the most of it.

This creates room for all the skullcracks which really ruin blocker math.

Ive had several games against lifegain where theyve probably gained about 15 life over the course of the match, but the ability to just top deck another threat and attack can carry you through quite far past turn 4.

The way to play this is ignore your own life total, and just max damage every turn, dont try to be too efficient with your burn - remove 1 toughness blockers when you can. About the only time you want to not be attacking is versus some kind of lifelink defensive setup where you are holding out for a skullcrack or shortcutter to make an alpha strike.

edit: One more thing, when someone casts Banisher Priest on your buffed Satyr Hoplite or similar, respond by burning the priest, the exile effect will never occur because the Priest is no longer in play, so you wont lose the buff on your Satyr.

Creatures:
4 Goblin Arsonist
4 Foundry Street Denizen
4 Goblin Bushwhacker
4 Satyr Hoplite
4 Goblin Shortcutter
2 Goblin Rabblemaster

Spells:
3 Coordinated Assault
4 Furor of the Bitten
4 Shock
3 Skullcrack
4 Inferno Fist
4 Krenko's Command

Land:
16 Mountain

I was in the same spot, there is just nothing good for that last slot. The card I am waiting on is hellspark elemental. That should put this deck over the top.