Bahamut, The Platinum

Flying, Lifelink, Convoke.
Bahamut, enters the battlefield with X +1/+1 counters on it.
{t}, Remove all counters from you & Bahamut:
Exile the top card of your library, you may play
that card this turn, if it is a dragon card you may
play it without paying it's mana cost, then repeat
this process for each counter removed this way.