Hearth Guardian

Flying and Menace
Choose one:
•{x}{t}, Put X +0/+1 counters on this card, where X is equal to the amount of mana you spent to cast this ability.
•{x}{t}, Look at the 10 cards of your library and cast 1 dragon among them with mana value X or less, where X is equal to the amount of mana you spent to cast this ability.