Is Spirit Flare legal in Standard, Modern, and Commander?

Spirit Flare is legal in: Legacy, Vintage, Commander, Pauper.

Spirit Flare

Q: What type of card is Spirit Flare?

Spirit Flare is an Instant. Its oracle text reads: "Tap target untapped creature you control. If you do, it deals damage equal to its power to target attacking or blocking creature an opponent controls. Flashback—{1}{W}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)"

Instant

Tap target untapped creature you control. If you do, it deals damage equal to its power to target attacking or blocking creature an opponent controls.

Flashback—, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)