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

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

What type of card is Adarkar Unicorn?

Adarkar Unicorn is a Creature — Unicorn. Its oracle text reads: "{T}: Add {U} or {C}{U}. Spend this mana only to pay cumulative upkeep costs."

Creature — Unicorn

: Add or . Spend this mana only to pay cumulative upkeep costs.

Set Ice Age

Rarity Common

Artist Quinton Hoover

Creature Commander Pauper Legacy