Is Essence Depleter legal in Standard, Modern, and Commander?

Essence Depleter is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Essence Depleter?

Essence Depleter is a Creature — Eldrazi Drone. Its oracle text reads: "Devoid (This card has no color.) {1}{C}: Target opponent loses 1 life and you gain 1 life. ({C} represents colorless mana.) *When Kozilek emerged at Sea Gate, his brood lineage swarmed to the surface.* Power/Toughness: 2/3"