Is Keen Duelist legal in Standard, Modern, and Commander?

Keen Duelist is legal in: Legacy, Vintage, Commander.

Keen Duelist

Q: What type of card is Keen Duelist?

Keen Duelist is a Creature — Human Wizard. Its oracle text reads: "At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand."

Creature — Human Wizard

At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand.

Set Commander 2021

Rarity Rare

Mana Value 2

Artist Lindsey Look

Collector # 42

Scryfall Gatherer