Dragonstone

{t}:add {b} or {r} to your mana pool. You lose 2 life.
House Targaryen—Whenever a Targaryen creature
enters the battlefield under your control you may
search your library for a dragon card. Reveal it and
put it into your hand. If you do not, create a
Targaryen Egg creature token.
"A place of dragons and dragonlords, the seat of
House Targaryen."
—See Davos Seaworth