Is The Wise Mothman legal in Standard, Modern, and Commander?

The Wise Mothman is legal in: Legacy, Vintage, Commander.

The Wise Mothman

Q: What type of card is The Wise Mothman?

The Wise Mothman is a Legendary Creature — Insect Mutant. Its oracle text reads: "Flying Whenever The Wise Mothman enters or attacks, each player gets a rad counter. Whenever one or more nonland cards are milled, put a +1/+1 counter on each of up to X target creatures, where X is the number of nonland cards milled this way."

Legendary Creature — Insect Mutant

Flying

Whenever The Wise Mothman enters or attacks, each player gets a rad counter.

Whenever one or more nonland cards are milled, put a +1/+1 counter on each of up to X target creatures, where X is the number of nonland cards milled this way.

Set Secret Lair Drop

Rarity Mythic Rare

Mana Value 4

Artist Chris Seaman

Collector # 2455

Scryfall