Orb of Dragonkind

{1},{t}: Add two mana in any mana combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons.

{r},{t}, Sacrifice Orb of Dragonkind: Look at
the top seven cards of your library. You may reveal a Dragon card from among them and
put it into your hand. Put the rest on the bottom of your library in a random order.