Is Bitter Feud legal in Standard, Modern, and Commander?

Bitter Feud is legal in: Legacy, Vintage, Commander.

Bitter Feud

Q: What type of card is Bitter Feud?

Bitter Feud is an Enchantment. Its oracle text reads: "As this enchantment enters, choose two players. If a source controlled by one of the chosen players would deal damage to the other chosen player or a permanent that player controls, that source deals double that damage to that player or permanent instead."

Enchantment

As this enchantment enters, choose two players.

If a source controlled by one of the chosen players would deal damage to the other chosen player or a permanent that player controls, that source deals double that damage to that player or permanent instead.

Set Commander Anthology Volume II

Rarity Rare

Mana Value 5

Artist Aaron Miller

Collector # 84

Scryfall Gatherer