Starfield Mystic is a rare Creature — Human Cleric card from Core Set 2020 (M20), collector number 39. Current market price: $0.44 (foil $2.84), 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.