Mmmm, so the viable stage 2 lines for starters with grass mons are Venusaur, this Tsareena, Meganium, Jumpluff (though we all know the attack is just not as good for it).
And the stage 1 lines are promo Lurantis, and Grovyle (because actually leaving Grovyle there is most of times much better).
I didn't realize there was so much support for grass types in standard available right now, though SLG Venusaur is rotating out on September and that's a shame. Also for Vileplume, since having it on deck with this would also be a problem for basic-only decks.
Keldeo GX is a nice toy for stall, that unfortunately is killed by Abandoned Power Plant, so it's not as good as Hoopa previously was. It's also a 2-prizer.