Is Luxa River Shrine legal in Standard, Modern, and Commander?

Luxa River Shrine is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Luxa River Shrine

Q: What type of card is Luxa River Shrine?

Luxa River Shrine is an Artifact. Its oracle text reads: "{1}, {T}: You gain 1 life. Put a brick counter on this artifact. {T}: You gain 2 life. Activate only if there are three or more brick counters on this artifact. *Without the God-Pharaoh, there would be no Luxa. Without the Luxa, there would be no life.*"