Is Planar Atlas legal in Standard, Modern, and Commander?

Planar Atlas is legal in: Legacy, Vintage, Commander.

Planar Atlas

Q: What type of card is Planar Atlas?

Planar Atlas is an Artifact. Its oracle text reads: "This artifact enters tapped. When this artifact enters, you may look at the top four cards of your library. If you do, reveal up to one land card from among them, then put that card on top of your library and the rest on the bottom in a random order. {T}: Add {C}."

Artifact

$0.31 ↗2 similarCommander, Legacy

This artifact enters tapped.

When this artifact enters, you may look at the top four cards of your library. If you do, reveal up to one land card from among them, then put that card on top of your library and the rest on the bottom in a random order.

: Add .