Is War Report legal in Standard, Modern, and Commander?

War Report is legal in: Modern, Legacy, Vintage, Commander, Pauper.

War Report

Q: What type of card is War Report?

War Report is an Instant. Its oracle text reads: "You gain life equal to the number of creatures on the battlefield plus the number of artifacts on the battlefield. *Underling Ethu's 263rd report read simply "Yes, my lord. Overwhelmingly, my lord." This marked the end of the Mirran-Phyrexian War.*"