Is Lifetap legal in Standard, Modern, and Commander?

Lifetap is legal in: Legacy, Vintage, Commander.

What type of card is Lifetap?

Lifetap is an Enchantment. Its oracle text reads: "Whenever a Forest an opponent controls becomes tapped, you gain 1 life."

Enchantment

Whenever a Forest an opponent controls becomes tapped, you gain 1 life.

Set Limited Edition Alpha

Rarity Uncommon

Artist Anson Maddocks

Enchantment Commander Legacy Vintage