Starfield Mystic is a rare Creature — Human Cleric card from Secrets of Strixhaven Commander (SOC), collector number 177. Current market price: $0.31, TCGplayer market prices via Scryfall.
Enchantment spells you cast cost {1} less to cast. Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on this creature.