Is Necron Monolith legal in Standard, Modern, and Commander?

Necron Monolith is legal in: Legacy, Vintage, Commander.

Necron Monolith

Q: What type of card is Necron Monolith?

Necron Monolith is an Artifact — Vehicle. Its oracle text reads: "Flying, indestructible Eternity Gate — Whenever this Vehicle attacks, mill three cards. For each creature card milled this way, create a 2/2 black Necron Warrior artifact creature token. Crew 4 (Tap any number of creatures you control with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.) Power/Toughness: 7/7"

Artifact — Vehicle

Flying, indestructible

Eternity Gate — Whenever this Vehicle attacks, mill three cards. For each creature card milled this way, create a 2/2 black Necron Warrior artifact creature token.

Crew 4 (Tap any number of creatures you control with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.)

Power/Toughness: 7/7

Set Warhammer 40,000 Commander

Rarity Rare

Mana Value 7

Artist Anthony Devine

Collector # 161

Scryfall