Is Paroxysm legal in Standard, Modern, and Commander?

Paroxysm is legal in: Legacy, Vintage, Commander.

Paroxysm

Q: What type of card is Paroxysm?

Paroxysm is an Enchantment — Aura. Its oracle text reads: "Enchant creature At the beginning of the upkeep of enchanted creature's controller, that player reveals the top card of their library. If that card is a land card, destroy that creature. Otherwise, it gets +3/+3 until end of turn."

Enchantment — Aura

Enchant creature

At the beginning of the upkeep of enchanted creature's controller, that player reveals the top card of their library. If that card is a land card, destroy that creature. Otherwise, it gets +3/+3 until end of turn.

Set Exodus

Rarity Uncommon

Mana Value 2

Artist Scott Kirschner

Collector # 94

Scryfall Gatherer