Is Necrogen Communion legal in Standard, Modern, and Commander?

Necrogen Communion is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Necrogen Communion

Q: What type of card is Necrogen Communion?

Necrogen Communion is an Enchantment — Aura. Its oracle text reads: "Enchant creature you control Enchanted creature has toxic 2. (Players dealt combat damage by it also get two poison counters.) When enchanted creature dies, return that card to the battlefield under your control."