Is Merchant of Truth legal in Standard, Modern, and Commander?

Merchant of Truth is legal in: Legacy, Vintage, Commander.

Merchant of Truth

Q: What type of card is Merchant of Truth?

Merchant of Truth is a Creature — Angel Detective. Its oracle text reads: "Flying Whenever a nontoken creature you control dies, investigate. Clues you control have exalted. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn for each instance of exalted among permanents you control.)"

Creature — Angel Detective

Flying

Whenever a nontoken creature you control dies, investigate.

Clues you control have exalted. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn for each instance of exalted among permanents you control.)

Set Murders at Karlov Manor Commander

Rarity Rare

Mana Value 4

Artist Carissa Susilo

Collector # 11

Scryfall Gatherer