Beledros Witherbloom is a mythic Legendary Creature — Elder Dragon card from Secrets of Strixhaven Commander (SOC), collector number 296. Current market price: $1.31, TCGplayer market prices via Scryfall.
Flying At the beginning of each upkeep, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life." Pay 10 life: Untap all lands you control. Activate only once each turn.