Witherbloom, the Balancer is a mythic Legendary Creature — Elder Dragon card from Secrets of Strixhaven (SOS), collector number 288. Current market price: $8.88 (foil $20.38), 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.