Mystic Penitent is a uncommon Creature — Human Nomad Mystic card from Odyssey (ODY), collector number 34. Current market price: $0.16 (foil $1.77), TCGplayer market prices via Scryfall.
Vigilance Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying.