Is Imminent Doom legal in Standard, Modern, and Commander?

Imminent Doom is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Imminent Doom

Q: What type of card is Imminent Doom?

Imminent Doom is an Enchantment. Its oracle text reads: "This enchantment enters with a doom counter on it. Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."

Enchantment

This enchantment enters with a doom counter on it.

Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment.

Set Hour of Devastation

Rarity Rare

Mana Value 3

Artist Daniel Ljunggren

Collector # 98

Scryfall Gatherer