Is Brokers' Safeguard legal in Standard, Modern, and Commander?

Brokers' Safeguard is legal in: Historic.

Brokers' Safeguard

Q: What type of card is Brokers' Safeguard?

Brokers' Safeguard is an Instant. Its oracle text reads: "Exile target nonartifact creature you control. It perpetually gains "This creature enters the battlefield with an additional shield counter on it." Then return that card to the battlefield under its owner's control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)"

Instant

Exile target nonartifact creature you control. It perpetually gains "This creature enters the battlefield with an additional shield counter on it." Then return that card to the battlefield under its owner's control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Set Alchemy: New Capenna

Rarity Rare

Mana Value 2

Artist Borja Pindado

Collector # 20

Scryfall