The Wise Mothman is a mythic Legendary Creature — Insect Mutant card from Secret Lair Drop (SLD), collector number 2455. Current market price: $12.77 (foil $13.25), TCGplayer market prices via Scryfall.
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.