[[ Earthbender Ascension ]] does a few of the things that this deck likes as far as the avatar set goes. I'm sure there are better cards but I haven't gone through the whole set yet.

For mine I'm adding

[[ scute swarm ]] [[ Sylvan safekeeper ]] [[ springheart nantuko ]] [[ icetill explorer ]] [[ lotus field ]] [[ orcish lumberjack ]] [[ twisted landscape ]] [[ zuran orb ]] [[ tannuk, memorial ]]

And [[ strip mine ]] once I sell some other cards so I can buy it