Is Cathedral Membrane legal in Standard, Modern, and Commander?

Cathedral Membrane is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Cathedral Membrane?

Cathedral Membrane is an Artifact Creature — Phyrexian Wall. Its oracle text reads: "({W/P} can be paid with either {W} or 2 life.) Defender When this creature dies during combat, it deals 6 damage to each creature it blocked this combat. Power/Toughness: 0/3"