Is Armix, Filigree Thrasher legal in Standard, Modern, and Commander?

Armix, Filigree Thrasher is legal in: Legacy, Vintage, Commander.

Armix, Filigree Thrasher

Q: What type of card is Armix, Filigree Thrasher?

Armix, Filigree Thrasher is a Legendary Artifact Creature — Golem. Its oracle text reads: "Whenever Armix attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you control plus the number of artifact cards in your graveyard. Partner (You can have two commanders if both have partner.)"

Legendary Artifact Creature — Golem

Whenever Armix attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you control plus the number of artifact cards in your graveyard.

Partner (You can have two commanders if both have partner.)

Set Commander Legends

Rarity Uncommon

Mana Value 3

Artist Daniel Ljunggren

Collector # 108

Scryfall Gatherer