Witherbloom, the Balancer is a mythic Legendary Creature — Elder Dragon card from Secrets of Strixhaven Promos (PSOS), collector number 245p. Current market price: $4.09 (foil $15.94), TCGplayer market prices via Scryfall.
Affinity for creatures (This spell costs {1} less to cast for each creature you control.) Flying, deathtouch Instant and sorcery spells you cast have affinity for creatures.