Is Increasing Savagery legal in Standard, Modern, and Commander?

Increasing Savagery is legal in: Modern, Legacy, Vintage, Commander.

Increasing Savagery

Q: What type of card is Increasing Savagery?

Increasing Savagery is a Sorcery. Its oracle text reads: "Put five +1/+1 counters on target creature. If this spell was cast from a graveyard, put ten +1/+1 counters on that creature instead. Flashback {5}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)"