Is Kellan, Planar Trailblazer legal in Standard, Modern, and Commander?

Kellan, Planar Trailblazer is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Kellan, Planar Trailblazer

Q: What type of card is Kellan, Planar Trailblazer?

Kellan, Planar Trailblazer is a Legendary Creature — Human Faerie Scout. Its oracle text reads: "{1}{R}: If Kellan is a Scout, it becomes a Human Faerie Detective and gains "Whenever Kellan deals combat damage to a player, exile the top card of your library. You may play that card this turn." {2}{R}: If Kellan is a Detective, it becomes a 3/2 Human Faerie Rogue and gains double strike."

Legendary Creature — Human Faerie Scout

: If Kellan is a Scout, it becomes a Human Faerie Detective and gains "Whenever Kellan deals combat damage to a player, exile the top card of your library. You may play that card this turn."