Nagorad, Caller of Flames

Descendant (This creature costs {1} less to cast for each creature you control that shares the same creature type)
Flying, Trample
When Nagorad enters the battlefield, put twice {x} Brood counters on Nagorad.
When Nagorad deals damage to the opponent, search your library for a Dragon creature with X or less converted mana cost, place it on the battlefield, and then remove 1 Brood counter, where X is the amount of Brood counters on Nagorad.