Is Brain Gorgers legal in Standard, Modern, and Commander?

Brain Gorgers is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Brain Gorgers?

Brain Gorgers is a Creature — Zombie. Its oracle text reads: "When you cast this spell, any player may sacrifice a creature of their choice. If a player does, counter Brain Gorgers. Madness {1}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.) *In spite of their hunger, they're slow eaters.* Power/Toughness: 4/2"