Is Mardu Strike Leader legal in Standard, Modern, and Commander?

Mardu Strike Leader is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Mardu Strike Leader?

Mardu Strike Leader is a Creature — Human Warrior. Its oracle text reads: "Whenever this creature attacks, create a 2/1 black Warrior creature token. Dash {3}{B} (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.)"

Mardu Strike Leader

Creature — Human Warrior

Whenever this creature attacks, create a 2/1 black Warrior creature token.

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.)