Is Brackwater Elemental legal in Standard, Modern, and Commander?

Brackwater Elemental is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Brackwater Elemental?

Brackwater Elemental is a Creature — Elemental. Its oracle text reads: "When this creature attacks or blocks, sacrifice it at the beginning of the next end step. Unearth {2}{U} ({2}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)"

Brackwater Elemental

Creature — Elemental

When this creature attacks or blocks, sacrifice it at the beginning of the next end step.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Set Duel Decks: Ajani vs. Nicol Bolas

Rarity Common

Mana Value 3

Artist Thomas M. Baxa

Collector # 46

Scryfall Gatherer