The Ur-Dragon

Flying,
Manifestation - As long as the Ur-Dragon is in your hand or on the battlefield, dragon spells you cast cost {1} less to cast.
Whenever the Ur-Dragon attacks, look at your library, then choose a dragon from your hand or library and put it on the battlefield, then shuffle your library.
Otherworldly -Whenever the Ur-Dragon becomes the target of an opponent's spell or ability it deals 5 damage to the opponent, unless the opponent pays {5}.