Dusk Sanctuary

Dusk Sanctuary comes into play tapped
{t}: Add {w} or {u} to your mana pool
When Dusk Sanctuary come into the battlefield , look up the 7 cards on the botton of your library. You can take one of a Dusk Sanctuary if you find one. Put the others cards on the bottom of your library in a random order . If a Dusk Sanctuary has put in your hand that way , reveal it and gain 1 life