Is Eradicator Valkyrie legal in Standard, Modern, and Commander?

Eradicator Valkyrie is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Eradicator Valkyrie?

Eradicator Valkyrie is a Creature — Angel Berserker. Its oracle text reads: "Flying, lifelink, hexproof from planeswalkers Boast — {1}{B}, Sacrifice a creature: Each opponent sacrifices a creature or planeswalker. (Activate only if this creature attacked this turn and only once each turn.) Power/Toughness: 4/3"

Eradicator Valkyrie

Creature — Angel Berserker

Flying, lifelink, hexproof from planeswalkers

Boast — , Sacrifice a creature: Each opponent sacrifices a creature or planeswalker. (Activate only if this creature attacked this turn and only once each turn.)