Is Caldera Breaker legal in Standard, Modern, and Commander?

Caldera Breaker is legal in: Historic.

Caldera Breaker

Q: What type of card is Caldera Breaker?

Caldera Breaker is an Artifact Creature — Golem. Its oracle text reads: "Trample When Caldera Breaker enters, exile all Mountain cards from your library. When you do, Caldera Breaker deals that much damage to target creature or planeswalker an opponent controls. When Caldera Breaker dies, put all cards exiled with it onto the battlefield under their owner's control. Conjure four cards named Volcanic Geyser into your library, then shuffle. Power/Toughness: 6/6"

Artifact Creature — Golem

Trample

When Caldera Breaker enters, exile all Mountain cards from your library. When you do, Caldera Breaker deals that much damage to target creature or planeswalker an opponent controls.

When Caldera Breaker dies, put all cards exiled with it onto the battlefield under their owner's control. Conjure four cards named Volcanic Geyser into your library, then shuffle.

Power/Toughness: 6/6

Set Alchemy: Ixalan

Rarity Mythic Rare

Mana Value 6

Artist Brian Valeza

Collector # 14

Scryfall