Obscura Ascendancy is a rare Enchantment card from Streets of New Capenna (SNC), collector number 207. Current market price: $0.21 (foil $0.09), TCGplayer market prices via Scryfall.
Whenever you cast a spell, if its mana value is equal to 1 plus the number of soul counters on this enchantment, put a soul counter on this enchantment, then create a 2/2 white Spirit creature token with flying. As long as there are five or more soul counters on this enchantment, Spirits you control get +3/+3.