Is World-Weary legal in Standard, Modern, and Commander?

World-Weary is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is World-Weary?

World-Weary is an Enchantment — Aura. Its oracle text reads: "Enchant creature Enchanted creature gets -4/-4. Basic landcycling {1}{B} ({1}{B}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)"