To be honnest, with the +1 magic in green there is already a powerfull green option.
I think magic damage will remain the meta (in low tiers) so i full agre with you, only good in specefic matchups and there is a free monster with thorns which is already quite strong.
I dont think i need it in any matchup.
How expensive is the flying girl? Thats some auto wins with earthquake
right now brighton bloom sitting around $12. Very situational but worth it.