Is Stalactite Dagger legal in Standard, Modern, and Commander?

Stalactite Dagger is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Stalactite Dagger

Q: What type of card is Stalactite Dagger?

Stalactite Dagger is an Artifact — Equipment. Its oracle text reads: "When this Equipment enters, create a 1/1 colorless Shapeshifter creature token with changeling. (It's every creature type.) Equipped creature gets +1/+1 and is all creature types. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)"