Is Templar Knight legal in Standard, Modern, and Commander?

Templar Knight is legal in: Modern, Legacy, Vintage, Commander.

Templar Knight

Q: What type of card is Templar Knight?

Templar Knight is a Creature — Human Knight. Its oracle text reads: "Vigilance {W}, Tap five untapped attacking creatures you control named Templar Knight: Search your library for a legendary artifact card, put it onto the battlefield, then shuffle. A deck can have any number of cards named Templar Knight."

Creature — Human Knight

Vigilance

, Tap five untapped attacking creatures you control named Templar Knight: Search your library for a legendary artifact card, put it onto the battlefield, then shuffle.

A deck can have any number of cards named Templar Knight.

Set Assassin's Creed

Rarity Uncommon

Mana Value 2

Artist Daniel Correia

Collector # 10

Scryfall Gatherer