Is Curse of Bounty legal in Standard, Modern, and Commander?

Curse of Bounty is legal in: Legacy, Vintage, Commander.

Curse of Bounty

Q: What type of card is Curse of Bounty?

Curse of Bounty is an Enchantment — Aura Curse. Its oracle text reads: "Enchant player Whenever enchanted player is attacked, untap all nonland permanents you control. Each opponent attacking that player untaps all nonland permanents they control."

Enchantment — Aura Curse

Enchant player

Whenever enchanted player is attacked, untap all nonland permanents you control. Each opponent attacking that player untaps all nonland permanents they control.

Set Commander 2017

Rarity Uncommon

Mana Value 2

Artist Kieran Yanner

Collector # 30

Scryfall Gatherer