Is Amphibian Downpour legal in Standard, Modern, and Commander?

Amphibian Downpour is legal in: Modern, Legacy, Vintage, Commander, Historic.

Amphibian Downpour

Q: What type of card is Amphibian Downpour?

Amphibian Downpour is an Enchantment — Aura. Its oracle text reads: "Flash Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies. Copies become tokens.) Enchant creature Enchanted creature loses all abilities and is a blue Frog creature with base power and toughness 1/1."