> Destroy all blocking creatures.

Reminds me of Ride Down and Fight to the Death. I think this would be white in most cases. I mean, it's mass Vanquish. Perhaps would be the best fit as indicated by the precedent.

Though this requires for you to have creatures so strangely it kinda could be justified in in a twisted sense. Ie. "Creatures you control gain deathtouch until end of turn." However, this would be closer to "Attacking creatures you control gain deathtouch and first strike until end of turn" and that doesn't feel right in at all.

Maybe if it was more inspired by the Cockatrice?

>
> Sorcery
> Destroy each creature that blocked a creature you control this turn.

Huh.

That doesn't change it at all in 2-player; limits it in multiplayer a bit.

I agree this needs a bit of flavour to make it green, where it's more naturally white. Cockatrice is good flavour for it.

It's also really really mean. But so is Overrun which will effectively be this +damage to opponent, usually.

Will change to white

Seems a bit too similar to Dust Hurricane though that card is probably a lot stronger.

Is it okay to keep them similar, so they are like different versions of the same card? I think that could be flavorful...

If they are just a bit TOO similar, we could still differentiate them. What are you thinking? (Also i'd like to balance the power levels if possible, or at least make them niche cards in their own ways)