Not sure what your budget is, but other handy lands include Reflecting Pool, Field of the Dead (if you can swap out some lands for snow lands), Mana Confluence, Temple of the False God, the Fetches on-color (or even Prismatic Vista or Fabled Passage if you're basic-heavy)
We have tools to do it, if we have time to set it up
They also continuously forgot to print the mana symbols instead of the letters, representing the mana needed
This isnt terribly far from my preferred number, as I usually like to run 11 or 12 myself, but its crucial to keep the cards coming in decks like these that are so vulnerable to board wipes
Goblin King, Goblin Warchief, and Goblin Chieftain are also staples, as haste and cost reduction are both invaluable things to have