Hi there, the deck looks great. My thoughts are if you want to make the most of your two creatures to use Flame Jab so even in topdeck mode every card will help, and Cinder Pyromancer would have synergy with everything else besides the Kiln Fiend while untapping to the Flame Jab. But the way your deck is now it has less to do with your 8 creatures and is mostly pure burn. Consider my suggestions only if you feel like having a more creature-oriented deck. Another idea might be to splash blue and go for Gelectrode or Wee Dragonauts. Good luck with your deck ideas.
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I recommend Swarmyard and Swarm of Rats... There's lots of Kamigawa rat-people in this rat deck. I love the Citanul Flute in the deck for the theme. Best of luck with your rat deck!
Making good use of Fire Servant, I see! Nothing like a 10 damage Lava Axe. I'm not too familiar with burn decks, but I recommend at least 20 mountains since most of your creatures cost 4+, and Lava Axe, Fireball, and Disintegrate will need plenty of land to cast. Good luck with your deck!