Is Arena legal in Standard, Modern, and Commander?

Arena is legal in: Modern, Legacy, Vintage, Commander.

Arena

Q: What type of card is Arena?

Arena is a Land. Its oracle text reads: "{3}, {T}: Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)"

Land

, : Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)