Is Thromok the Insatiable legal in Standard, Modern, and Commander?

Thromok the Insatiable is legal in: Legacy, Vintage, Commander.

Thromok the Insatiable

Q: What type of card is Thromok the Insatiable?

Thromok the Insatiable is a Legendary Creature — Hellion. Its oracle text reads: "Devour X, where X is the number of creatures devoured this way (As this creature enters, you may sacrifice any number of creatures. It enters with X +1/+1 counters on it for each of those creatures.)"

Legendary Creature — Hellion

Devour X, where X is the number of creatures devoured this way (As this creature enters, you may sacrifice any number of creatures. It enters with X +1/+1 counters on it for each of those creatures.)

Set Planechase Anthology

Rarity Mythic Rare

Mana Value 5

Artist Terese Nielsen

Collector # 106

Scryfall Gatherer