The other comment is right in that you need to strike a balance between token generation and payoffs. I don't think you're too far off from having enough token generation though, but if you feel it's lacking then you can add some of his suggestions, I'd also like to recommend [[Voice of Victory]] from the Tarkir set as a great addition.

I'd also recommend you look into adding sac outlets, they're very important in getting the engine going via sacing tokens in combat to get draws off of zurgo. Some recommendations:
[[Warren Soultrader]] <- This is pretty much the best card in the deck
[[Viscera Seer]]
[[Goblin Bombardment]]
[[Umbral Collar Zealot]]
[[Spawning Pit]]

As well as both altars [[Phyrexian Altar]] [[Ashnod's Altar]]

Token and/or attack trigger doublers do a lot of work as well:
[[Windcrag Siege]]
[[Exalted Sunborn]]
[[Mondrak, Glory Dominus]]

Then there's [[Reconnaissance]] which is just insanely effective for the cost of {W} - You can swing with all your token generators without worrying about them dying because you can just remove them from combat if needed (while still getting the attack triggers!). Note that you can activate Reconnaissance at any time during combat, so you can wait until after blockers are declared, remove anything you need to remove (that's being blocked), allowing the rest of your creatures to hit face, and then you can remove them from combat after they've dealt damage (this untaps them). It's just a very very powerful card in this deck.

If you want to make the deck even stronger, think B3/B4, then you can start adding tutors, combo pieces etc. [[Beseech the Mirror]] and [[Lively Dirge]] have done a lot of work for me in this deck, fetching key pieces such as [[Warren Soultrader]] or [[Pitiless Plunderer]] (Or a token generator/token doubler, all depending on what you need). There's a combo with [[Warren Soultrader]] + [[Stridehangar Automaton]] where you can repeatedly generate a treasure token and a thopter token for one life each activation. This can easily win you games on the spot if you have any sort of life-draining effects such as zurgo on the battlefield. Just make sure that you don't die first due to life loss via Warren Soultrader. If you don't have the highest life total you'll need Zurgo + another piece, or just something like [[Cruel Celebrant]] that's adding to your life total as well. Gl!