Is Thrun, the Last Troll legal in Standard, Modern, and Commander?

Thrun, the Last Troll is legal in: Modern, Legacy, Vintage, Commander.

Thrun, the Last Troll

Q: What type of card is Thrun, the Last Troll?

Thrun, the Last Troll is a Legendary Creature — Troll Shaman. Its oracle text reads: "This spell can't be countered. Hexproof (This creature can't be the target of spells or abilities your opponents control.) {1}{G}: Regenerate Thrun. *His crime was silence, and now he suffers it eternally.* Power/Toughness: 4/4"