Is Darksteel Garrison legal in Standard, Modern, and Commander?

Darksteel Garrison is legal in: Modern, Legacy, Vintage, Commander.

Darksteel Garrison

Q: What type of card is Darksteel Garrison?

Darksteel Garrison is an Artifact — Fortification. Its oracle text reads: "Fortified land has indestructible. Whenever fortified land becomes tapped, target creature gets +1/+1 until end of turn. Fortify {3} ({3}: Attach to target land you control. Fortify only as a sorcery. This card enters unattached and stays on the battlefield if the land leaves.)"

Artifact — Fortification

Fortified land has indestructible.

Whenever fortified land becomes tapped, target creature gets +1/+1 until end of turn.

Fortify (: Attach to target land you control. Fortify only as a sorcery. This card enters unattached and stays on the battlefield if the land leaves.)