Is Flash Conscription legal in Standard, Modern, and Commander?

Flash Conscription is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Flash Conscription?

Flash Conscription is an Instant. Its oracle text reads: "Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. If {W} was spent to cast this spell, the creature gains "Whenever this creature deals combat damage, you gain that much life" until end of turn."

Flash Conscription

Instant

Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. If was spent to cast this spell, the creature gains "Whenever this creature deals combat damage, you gain that much life" until end of turn.