Is Heap Gate legal in Standard, Modern, and Commander?

Heap Gate is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Heap Gate?

Heap Gate is a Land — Gate. Its oracle text reads: "{T}: Add {C}. {1}, {T}: Add one mana of any color. {1}, {T}, Tap an untapped Gate you control: Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")"