Is Portal Mage legal in Standard, Modern, and Commander?

Portal Mage is legal in: Legacy, Vintage, Commander.

Portal Mage

Q: What type of card is Portal Mage?

Portal Mage is a Creature — Human Wizard. Its oracle text reads: "Flash When this creature enters during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking. (It can't attack its controller or their permanents.) Power/Toughness: 2/2"

Creature — Human Wizard

Flash

When this creature enters during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking. (It can't attack its controller or their permanents.)

Power/Toughness: 2/2

Set Commander Masters

Rarity Uncommon

Mana Value 3

Artist Yongjae Choi

Collector # 112

Scryfall