Is Gloomfang Mauler legal in Standard, Modern, and Commander?

Gloomfang Mauler is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Gloomfang Mauler

Q: What type of card is Gloomfang Mauler?

Gloomfang Mauler is a Creature — Nightmare. Its oracle text reads: "Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.) Backup 2 (When this creature enters, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.) Menace Power/Toughness: 5/5"

Creature — Nightmare

Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Backup 2 (When this creature enters, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)

Menace

Power/Toughness: 5/5

Set March of the Machine

Rarity Common

Mana Value 7

Artist Denis Zhbankov

Collector # 108

Scryfall