Maga, Traitor to Mortals is a rare Legendary Creature — Human Wizard card from Saviors of Kamigawa (SOK), collector number 81. Current market price: $3.10 (foil $18.54), TCGplayer market prices via Scryfall.
Maga enters with X +1/+1 counters on it. When Maga enters, target player loses life equal to the number of +1/+1 counters on it.