Is Vaultbreaker legal in Standard, Modern, and Commander?

Vaultbreaker is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Vaultbreaker?

Vaultbreaker is a Creature — Orc Rogue. Its oracle text reads: "Whenever this creature attacks, you may discard a card. If you do, draw a card. Dash {2}{R} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.) Power/Toughness: 4/2"

Vaultbreaker

Creature — Orc Rogue

Whenever this creature attacks, you may discard a card. If you do, draw a card.

Dash (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)