Is Tranquil Frillback legal in Standard, Modern, and Commander?

Tranquil Frillback is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Tranquil Frillback

Q: What type of card is Tranquil Frillback?

Tranquil Frillback is a Creature — Dinosaur. Its oracle text reads: "When this creature enters, you may pay {G} up to three times. When you pay this cost one or more times, choose up to that many — • Destroy target artifact or enchantment. • Exile target player's graveyard. • You gain 4 life."