Is Kathril, Aspect Warper legal in Standard, Modern, and Commander?

Kathril, Aspect Warper is legal in: Legacy, Vintage, Commander.

Kathril, Aspect Warper

Q: What type of card is Kathril, Aspect Warper?

Kathril, Aspect Warper is a Legendary Creature — Nightmare Insect. Its oracle text reads: "When Kathril enters, put a flying counter on any creature you control if a creature card in your graveyard has flying. Repeat this process for first strike, double strike, deathtouch, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Then put a +1/+1 counter on Kathril for each counter put on a creature this way."

Legendary Creature — Nightmare Insect

When Kathril enters, put a flying counter on any creature you control if a creature card in your graveyard has flying. Repeat this process for first strike, double strike, deathtouch, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Then put a +1/+1 counter on Kathril for each counter put on a creature this way.

Set Commander 2020

Rarity Mythic Rare

Mana Value 5

Artist Mathias Kollros

Collector # 10

Scryfall Gatherer