Keeper of the Tome

{5}{t} Draw a card, then draw two cards if you
control a Dragon
{x}{t} Destroy target Dragon with converted mana
cost X
Sacrifice Keeper of the Tome: Search your
library or graveyard for a card named The Tome
of Dragons, reveal it, then put it into your hand.
If you searched your library this way, shuffle it.
The Keepers of the Tome are masters of
Dragonlore, and are more than willing to use that knowledge.