Is Sin, Unending Cataclysm legal in Standard, Modern, and Commander?

Sin, Unending Cataclysm is legal in: Legacy, Vintage, Commander.

Sin, Unending Cataclysm

Q: What type of card is Sin, Unending Cataclysm?

Sin, Unending Cataclysm is a Legendary Creature — Leviathan Avatar. Its oracle text reads: "Flying, trample As Sin enters, remove all counters from any number of artifacts, creatures, and enchantments. Sin enters with X +1/+1 counters on it, where X is twice the number of counters removed this way. When Sin dies, put its counters on target creature you control, then shuffle this card into its owner's library. Power/Toughness: 5/5"

Legendary Creature — Leviathan Avatar

Flying, trample

As Sin enters, remove all counters from any number of artifacts, creatures, and enchantments. Sin enters with X +1/+1 counters on it, where X is twice the number of counters removed this way.

When Sin dies, put its counters on target creature you control, then shuffle this card into its owner's library.

Power/Toughness: 5/5

Set Final Fantasy Commander

Rarity Rare

Mana Value 7

Artist Aldo Domínguez

Collector # 95

Scryfall