Daenerys, The Unburnt

Exalted
Whenever Daenerys, The Unburnt attacks alone,
you may search your library for a dragon
creature with converted mana cost X or less and
put it onto the battlefield attacking. X is the
number of counters on Daenerys, The Unburnt.
Whenever an exalted ability trigger, put an additional +1/+1 counter on that creature.