Is Powerbalance legal in Standard, Modern, and Commander?

Powerbalance is legal in: Modern, Legacy, Vintage, Commander, Historic.

Powerbalance

Q: What type of card is Powerbalance?

Powerbalance is an Enchantment. Its oracle text reads: "Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, you may cast that card without paying its mana cost if the two spells have the same mana value."

Enchantment

Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, you may cast that card without paying its mana cost if the two spells have the same mana value.

Set Modern Horizons 3

Rarity Rare

Mana Value 2

Artist Steve Ellis

Collector # 131

Scryfall Gatherer