Is Crimson Muckwader legal in Standard, Modern, and Commander?

Crimson Muckwader is legal in: Modern, Legacy, Vintage, Commander.

Crimson Muckwader

Q: What type of card is Crimson Muckwader?

Crimson Muckwader is a Creature — Lizard. Its oracle text reads: "This creature gets +1/+1 as long as you control a Swamp. {2}{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) Power/Toughness: 2/1"

Creature — Lizard

This creature gets +1/+1 as long as you control a Swamp.

: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)