Is Spawning Grounds legal in Standard, Modern, and Commander?

Spawning Grounds is legal in: Legacy, Vintage, Commander.

What type of card is Spawning Grounds?

Spawning Grounds is an Enchantment — Aura. Its oracle text reads: "Enchant land Enchanted land has "{T}: Create a 5/5 green Beast creature token with trample." *It's the only water source in miles of desert, but the local tribes avoid it at all costs.*"