Is Kjeldoran Outpost legal in Standard, Modern, and Commander?

Kjeldoran Outpost is legal in: Legacy, Vintage, Commander.

Kjeldoran Outpost

Q: What type of card is Kjeldoran Outpost?

Kjeldoran Outpost is a Land. Its oracle text reads: "If Kjeldoran Outpost would enter, sacrifice a Plains instead. If you do, put Kjeldoran Outpost onto the battlefield. If you don't, put it into its owner's graveyard.{T}: Add {W}.{1}{W}, {T}: Create a 1/1 white Soldier creature token."

Land

If Kjeldoran Outpost would enter, sacrifice a Plains instead. If you do, put Kjeldoran Outpost onto the battlefield. If you don't, put it into its owner's graveyard.<br>: Add .<br>, : Create a 1/1 white Soldier creature token.