Is Dead Before Sunrise legal in Standard, Modern, and Commander?

Dead Before Sunrise is legal in: Legacy, Vintage, Commander.

What type of card is Dead Before Sunrise?

Dead Before Sunrise is an Instant. Its oracle text reads: "Until end of turn, outlaw creatures you control get +1/+0 and gain "{T}: This creature deals damage equal to its power to target creature." (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)"

Dead Before Sunrise

Instant

Until end of turn, outlaw creatures you control get +1/+0 and gain ": This creature deals damage equal to its power to target creature." (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)