Dragons Den

{t} Add any color of mana to your mana pool to
cast Dragon spells.
{t}{r}{4} Search your library for
any dragon card with a converted
mana cost of 5 or less, reveal it,
you may choose to play that
card without paying its mana cost,
if not, put it in your hand, shuffle
your library, Scry 4, and draw 4 cards,
reveal any dragon cards drawn this way.