Is April O'Neil, Human Element legal in Standard, Modern, and Commander?

April O'Neil, Human Element is legal in: Legacy, Vintage, Commander.

April O'Neil, Human Element

Q: What type of card is April O'Neil, Human Element?

April O'Neil, Human Element is a Legendary Creature — Human Detective. Its oracle text reads: "Whenever a player casts an artifact, instant, or sorcery spell, you create a Mutagen token. (It's an artifact with "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")"

Legendary Creature — Human Detective

Whenever a player casts an artifact, instant, or sorcery spell, you create a Mutagen token. (It's an artifact with ", , Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")