The Amethyst, Symbol of Truth

{t}: Add {u} or {r}.
{u}{r}, {t}: Gain control of up to one target
creature you own. Draw a card, then discard a
card.
{2}{u}{r}: Look at the top five cards of your library.
You may reveal a Purple Dragon card from
among them and put it into your hand. Put the
rest on the bottom of your library in a random
order.