I really like this card, but I think 5x treefolk to make it work is too much. What if you dropped it to 4x treefolk unupped and 3x if upped?
If you had a mix of upped + unupped on the field, they'd all count as 'treefolk', and you could activate the upped one if you had say 1x upped and 2x unupped, but not the unupped ones
For 3x upped, assuming you had 6 in the deck, you'd still have to go through half your deck on average (and have them survive, and have earth quanta) to use the ability. Getting the earth quanta even in monolife wouldn't be too bad; you could use upped gnomes or an earth mark to make it work.