Is Towering Viewpoint legal in Standard, Modern, and Commander?

Towering Viewpoint is legal in: Modern, Legacy, Vintage, Commander.

Towering Viewpoint

Q: What type of card is Towering Viewpoint?

Towering Viewpoint is an Artifact Creature — Wall. Its oracle text reads: "Defender, reach Leap of Faith — {3}: Target creature gains flying until end of turn. *The leap of faith is a sacred rite of the Assassins—it strengthens their resolve and purges fear from their hearts.* Power/Toughness: 0/4"