Is Snarlfang Vermin legal in Standard, Modern, and Commander?

Snarlfang Vermin is legal in: Historic.

Snarlfang Vermin

Q: What type of card is Snarlfang Vermin?

Snarlfang Vermin is a Creature — Rat. Its oracle text reads: "Whenever Snarlfang Vermin deals combat damage to a creature, if that creature is still on the battlefield, suspect that creature. It perpetually gains this ability. Whenever a suspected creature an opponent controls dies while Snarlfang Vermin is in your graveyard, that opponent loses 1 life. Power/Toughness: 2/1"

Creature — Rat

Whenever Snarlfang Vermin deals combat damage to a creature, if that creature is still on the battlefield, suspect that creature. It perpetually gains this ability.

Whenever a suspected creature an opponent controls dies while Snarlfang Vermin is in your graveyard, that opponent loses 1 life.

Power/Toughness: 2/1

Set Alchemy: Murders at Karlov Manor

Rarity Uncommon

Mana Value 1

Artist Ernanda Souza

Collector # 12

Scryfall