Green cards, and theorycraft, abound below. Check 'em out:
Pretty sweet Mythic, but I'd have preferred Haste over Vigilance. Still, this is pretty playable, though not on the same level as Prime Time or Woodfall Primus, etc. In other words, it won't be a staple of Green decks everywhere, but if there's even a hint of a +1/+1 counter theme in your deck, it is definitely worthy of consideration.
Nice. Odd combination of effects, but the versatility is there. That and it's hard creature kill for Green which doesn't really get tons of it. I don't know that you'd play this over Plummet... but you might.
Also funny: Targeting Mindles Automaton with this turns it into a Harmonize!
Next: Multicolor, Lands and Artifacts. Enjoy!