Is Rockalanche legal in Standard, Modern, and Commander?

Rockalanche is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Rockalanche

Q: What type of card is Rockalanche?

Rockalanche is a Sorcery — Lesson. Its oracle text reads: "Earthbend X, where X is the number of Forests you control. (Target land you control becomes a 0/0 creature with haste that's still a land. Put X +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.) Flashback {5}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)"

Sorcery — Lesson

$0.26 ↗20 similarCommander, Modern

Earthbend X, where X is the number of Forests you control. (Target land you control becomes a 0/0 creature with haste that's still a land. Put X +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)