Is Prosperous Thief legal in Standard, Modern, and Commander?

Prosperous Thief is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Prosperous Thief

Q: What type of card is Prosperous Thief?

Prosperous Thief is a Creature — Human Ninja. Its oracle text reads: "Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever one or more Ninja or Rogue creatures you control deal combat damage to a player, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")"

Creature — Human Ninja

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever one or more Ninja or Rogue creatures you control deal combat damage to a player, create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")