Why does green get a ability ?

About as black as it is white; this is very very red.

Green gets to do damage to all fliers but to all creatures? Closest I can find is 'choking vines' which is both very old and, basically, is kind of conceptually summoning a token swarm.

Although - I can't actually find an example of "Deals damage out as punishment when this gets hurt". Maybe exploding barrels can be green? I'd warn that it's maybe a bit easy to turn into a wrath effect; but eh, it costs as much as a wrath does, and it'll take effort to make it repeatable. So that's probably ok.

These are valid color pie concerns, and this card was designed with flavor in mind first. I'll think about how I can rework this card to be more green-friendly, or redesign it into a red card.