Randy, Lord of Drakes

Flying, vigilance, first strike, haste, trample
Whenever a dragon you control attacks an
opponent, add 2 mana of any combination of
it's colors to your mana pool. Until end of turn,
you don't loose this mana as steps and phases
end.
{w}{u}{b}{r}{g},{t}: put a dragon card from your
hand onto the battlefield.