Is Strength from the Fallen legal in Standard, Modern, and Commander?

Strength from the Fallen is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Strength from the Fallen

Q: What type of card is Strength from the Fallen?

Strength from the Fallen is an Enchantment. Its oracle text reads: "Constellation — Whenever this enchantment or another enchantment you control enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard."

Enchantment

Constellation — Whenever this enchantment or another enchantment you control enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.

Set Journey into Nyx

Rarity Uncommon

Mana Value 2

Artist Min Yum

Collector # 143

Scryfall