Is Horror of Horrors legal in Standard, Modern, and Commander?

Horror of Horrors is legal in: Modern, Legacy, Vintage, Commander.

Horror of Horrors

Q: What type of card is Horror of Horrors?

Horror of Horrors is an Enchantment. Its oracle text reads: "Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)"

Enchantment

Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Set Legends

Rarity Uncommon

Artist Mark Tedin