Sam and I had a few talks about this card, because it definitely bends what green can do, but when I pulled back and looked at the card in a big picture way, I felt that it was justifiedmuch like when we did Form of the Dragon
Frog Butler Frog Tongue Frog-Squirrels Froghemoth Frogify Frogkin Kidnapper (playtest) Frogmite Frogmyr Enforcer Frogtosser Banneret Genghis Frog Haze Frog King Solomon's Frogs Leapfrog Plaxcaster Frogling Poison Dart Frog Psychic Frog Punk Frogs Rampant Frogantua Spore Frog The Fabulous Frog-Man Turn to Frog Whiptongue Frog
I feel Pestilence might be amazing, it's much better if you can give it Lifelink or Deathtouch, usually via a Counter that Nesting Grounds moved (Boot Nipper, Scavenged Brawler, Unbreakable Bond, Unexpected Fangs, Call of the Death-Dweller, Evolved Sleeper, or Void Beckoner, some of those seem solid actually), but even without either it's a great effect to clear out weenies, and your Commander keeps it around pretty consistently
They're also often the glue of Limited formats and the cards you underestimate until one proceeds to overperform against you in three consecutive games
BRg Midrange by GibsonJunkie BRG (i.e., Jund) is one of those colors that people have a strong attachment to and several flavors have been developed over the years
This might be the best +1/+1 counter payoff in Commander