Is Thrashing Mossdog legal in Standard, Modern, and Commander?

Thrashing Mossdog is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

What type of card is Thrashing Mossdog?

Thrashing Mossdog is a Creature — Plant Dog. Its oracle text reads: "Reach (This creature can block creatures with flying.) Scavenge {4}{G}{G} ({4}{G}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)"

Thrashing Mossdog

Creature — Plant Dog

Reach (This creature can block creatures with flying.)

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)