Is Knowledge Vault legal in Standard, Modern, and Commander?

Knowledge Vault is legal in: Legacy, Vintage, Commander.

Knowledge Vault

Q: What type of card is Knowledge Vault?

Knowledge Vault is an Artifact. Its oracle text reads: "{2}, {T}: Exile the top card of your library face down.{0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand.When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's graveyard."

Artifact

, : Exile the top card of your library face down.<br>: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand.<br>When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's graveyard.