Kathril, Aspect Warper is a mythic Legendary Creature — Nightmare Insect card from Commander 2020 (C20), collector number 10. Current market price: $1.11 (foil $0.49), TCGplayer market prices via Scryfall.
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.