Is Solemn Doomguide legal in Standard, Modern, and Commander?

Solemn Doomguide is legal in: Legacy, Vintage, Commander.

What type of card is Solemn Doomguide?

Solemn Doomguide is a Creature — Tiefling Cleric. Its oracle text reads: "Flying Each creature card in your graveyard that's a Cleric, Rogue, Warrior, and/or Wizard has unearth {1}{B}. ({1}{B}: Return the card to the battlefield. The creature gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)"

Solemn Doomguide

Creature — Tiefling Cleric

Flying

Each creature card in your graveyard that's a Cleric, Rogue, Warrior, and/or Wizard has unearth . (: Return the card to the battlefield. The creature gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)