Lunar Convocation is a rare Enchantment card from Bloomburrow Promos (PBLB), collector number 223s. Current market price: — (foil $1.76), TCGplayer market prices via Scryfall.
At the beginning of your end step, if you gained life this turn, each opponent loses 1 life. At the beginning of your end step, if you gained and lost life this turn, create a 1/1 black Bat creature token with flying. {1}{B}, Pay 2 life: Draw a card.