Is Favor of Jukai legal in Standard, Modern, and Commander?

Favor of Jukai is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Favor of Jukai

Q: What type of card is Favor of Jukai?

Favor of Jukai is an Enchantment — Aura. Its oracle text reads: "Enchant artifact or creature As long as enchanted permanent is a creature, it gets +3/+3 and has reach. Channel — {1}{G}, Discard this card: Target creature gets +3/+3 and gains reach until end of turn. *The land chooses its own champions.*"