Is Capashen Unicorn legal in Standard, Modern, and Commander?

Capashen Unicorn is legal in: Legacy, Vintage, Commander, Pauper.

Capashen Unicorn

Q: What type of card is Capashen Unicorn?

Capashen Unicorn is a Creature — Unicorn. Its oracle text reads: "{1}{W}, {T}, Sacrifice this creature: Destroy target artifact or enchantment. *Capashen riders were stern and humorless even before their ancestral home was reduced to rubble.* Power/Toughness: 1/2"