Narset, Jeskai Waymaster is a rare Legendary Creature — Human Monk card from Tarkir: Dragonstorm Promos (PTDM), collector number 209p. Current market price: $0.30 (foil $0.39), TCGplayer market prices via Scryfall.
At the beginning of your end step, you may discard your hand. If you do, draw cards equal to the number of spells you've cast this turn.