I feel like this is one of the most well-realized precon decks ever out of the box, so you dont necessarily need to change 30% of the cards straight away even if I told you to jam a few games, talk with your group about the power level you want, and then decide where you want to land on the scale between AFR Set Constructed Venture Tribal and Legacy Reanimator Combo
Full Card Gallery Avatar: The Last Airbender An interactive guide of every card available in Avatar: The Last Airbender
Because damage remains marked on a creature until the cleanup step or an effect removes that damage, nonlethal damage dealt to a creature may become lethal if you switch its power and toughness during that turn
Organic Extinction Organic Extinction is pretty costly, but your artifact creatures can help cast it, taking quite the edge off
In this current meta where you are guaranteed to see Treasures in almost every game, Professional Face-Breaker also provides some card advantage with Treasures you don't intend to use
Rank: Fun in the 99 Edgar, Master MachinistEdgar, Master Machinist It could be cool to recast Ichor WellspringIchor Wellspring or Mycosynth WellspringMycosynth Wellspring for value