Is Croaking Counterpart legal in Standard, Modern, and Commander?

Croaking Counterpart is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Croaking Counterpart?

Croaking Counterpart is a Sorcery. Its oracle text reads: "Create a token that's a copy of target non-Frog creature, except it's a 1/1 green Frog. Flashback {3}{G}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.) *Frog is the sincerest form of flattery.*"