Slumbering Dragon is a rare Creature — Dragon card from Magic 2013 (M13), collector number 148. Current market price: $1.87 (foil $9.56), TCGplayer market prices via Scryfall.
Flying This creature can't attack or block unless it has five or more +1/+1 counters on it. Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on this creature.