Calatin, Servant of the Dragon

Calatin, Servant of the Dragon enters the
battlefield with X +1/+1 counters on it.
{t}: For each +1/+1 counter on Calatin, Servant
of the Dragon, add mana of any one color to your
mana pool. Spend this mana only to cast dragon
spells or activate abilities of dragon permanents.
"Power comes in response to a need, not a desire.
You must create that need."